CANADIAN FARM BUILDING PLAN SERVICE - CSBE-SCGAB · dard stall barns varying in size from 12-16...

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CANADIAN FARM BUILDING PLAN SERVICE by J. M. Armstrong Member C .A.Eng .S. Can ada Department of Ag riculture, Ottawa, ant. The Can ad ian F arm Buildin g P l an Service was orga n ize d to devel op and pro d u ce workin g drawings for the co nst ruction of farm servic e b ui ld ings and r elat ed labor saving equ ipme nt an d to present informati on on th e design 01 se rvice bu ildings in rel at i on to managem ent , lab or requi r em ents and other factors affecting liv es tock .m cl crop enterp ri ses. Th e Plan Service was initi at ed a nd has been co-ord ina ted by th e N ation - al C ommittee on Agricultu ra l E ng i n- eering, m ad e up of agr icult ura l en - gineers from the Federal and P rovin- cia l Department s of Agricultur e and Agricult ur al C oll eges in Cana da. Ear ly Eff orts to Dev elop a Plan Service T he establi sh m e nt o f a co- ordin at ed pl an service co ver ing farm bu ild in gs and Iacili ties was r ecommended by th e N ational Comm ittee on Agri cul - tur al En gin e erin g a t th e in au gur al meet in g o f th e N .C. A.E. at Ott aw a in 1944 . Thi s was e nvis ioned in some Cl ll<lrters as a co-o per ative exch a nge of plans amon g Fe de r a l and Prov in - cia l institution s.. \ sub-committee on Farm Buildin gs was se t up by th e N . C. A.E . to study th e problem of crea- tin g a pl an se rvic e and lias on was ma de with N ati on a l Housin g, es ta b- li sh ed under t he N ational H ou sin g Act o f 1944. Th e Farm Buil din gs Sub-C o m mit - tee met in 194 5 a t th e Exp erim ent al Fa rm , Swift Curren t, Sask., to co nsi - der ava ilable far m ho us i ng a n d ser- v ice building plans. Plans a do p te d incl uded five for fa r m houses, tw o l or farm workshops, two tor grain stor age, two for cattle and horses, two for pig- ge r ies and pl an s for ce rta in livestock eq u ipm eru . It wa s pro pos ed th at th ese p lan s be redraft ed at the archit e ctu ral o l'Iicc o f the E xp eri m ental Farms Ser- vice. To hand le th e work, thre e pos i- tious were establ ish ed in the foll owing yea r, for t nis dra ftin g offic e but were nev er I illecl du e to th e' scar city of q ual ified dra lt siu cn and the i na qe- q u ec y 01 salari es tha t could be offere d. By 1949, even with the limit ed s ta ff tim e available, five ho using plan s h ad been dr afted, to geth er wi th pla ns lor two general purp ose b arn s, a far m worksh op , a bro od er house and th ree pi eces of p oult ry equipment. These wer e not suHici e nt to start a pl an ser- vice and no pa r ti cular funds were available for dis t ribution of th ese pl an s. J n 1949, so me t en prelimin ary farm h ousing plan s were publish ed und er th e auspi ces of the P r ai ri e Rur al H ou sin g C o m mi tt ee su ppo rted by th e Go ve rn me n ts of the Prairi e Provin ces a nd Cen tral Mo r tga e a n d Hou sin g C or po ra t ion . A n urgen t need lor farm ho using plans ha d thus been partl y me t. !I. N ew A pproacl. 1n 195 1 th e Eas te rn Sec t io n o f th e N.C.A. £. se t up a sub-commi tt ee to coll ect and repo rt on farm buildin g plan s a va il ab le in East ern Canad a. Some '14 6 pI ans were collected, of the se 26 rel at ed to farm b u ildi ngs and 243 to ba rn s, as rep ort ed to th e Se- co nel Co n fe re nce of the N.C.A.E. h eld at Ott aw a in 1952. Pr o vin cial repr e- sent ati ves at the Confere n ce wer e asked wh at type of far m buildin g plan s were most ur g entl y requ ir ed in each reg io n . Th is indi cat ed the cla sses o f se rv ice buildi ng pia ns re- quir ed and tha t plans lor far m hous- in g was n ot an ur gent pro bl e m . At th e 1953 meeting of th e Western Section of the N.C.A .E . it was pro - pos ed th a t the prepa rati on of servi ce build ing plans be un d ert ak en o n th e ba sis ol eig ht separate classes of build - ings with a sub-co mm ittee for each class. A t a m eeting of the Ea ste rn Sec- tion of tile N.C.A.E., which followed shortly , th e Executive of the N.C.A .E . named the nucleus of Pl an C ommit - tees [or Beef C attl e, Dairy C attl e, Swin e, Sh e ep, Poultr y, G ra in Sto rage, Fruit a nd Veg etable S tor age and Ma - chin er y Sto ra ge and Mi scel laneous, subs equ en tly designat ed Spec ial Stru c- tures. Ca ta log ues of pla ns p ub lished by the Canadian Farm Buildin g Pla n Service . T wo me mb ers were ap po inted to each pl an commi tt eee , with power to add livestock and oth er specialists, with a vi ew to preparin g a catalogue of pl a ns cove ri ng thei r p articul ar class of bu ildings. Dr aftin g Service was to be pro vided at the Ont a rio Ag- ricultu r al Co llege and th e Exp erimen- tal Farm , Swift Current. Sub sequent a r ra nge me nts were mad e l or dr aftin g' to be don e a t th e C ent ra l Lp c ri me n t a l Farm thu s ma ki ng thre e d r aftin g cen- t res avail a ble. S1IiJ Port For Th e Program The prop osed program was su b- mitred to th e Exec u tiv e of th e N ati on- al Ad visory 'Committee on Agricul- tural Ser vices, repres en tin g all Departm ent s of Agricul tur e and th« Agricult ura l Co lleges, in May 195;) ami auth orizati on sec u re d to co lla bo- r at e WIth r epresentati ve A n ima l Hu s- b andm en and o the r groups in com- p iling data w it h respect to t he pro- po sed build in g plan ser vice. By August 1953 it was possibl e to r eport to the N ati on al A dv iso ry Co mmi ttee th at nearl y a ll pl an cornr ni t tecss had completed memb er ship arr an g em ents, actual! y 1I1 0re th an forty pe rson s were in volved, th at progress had been made in t he assem bl y 01 plan mat eri al and t ha t the Publ icati ons Committ ee had agree d to ce rta in draftin g prac ti ces for th e prepara ti on of plan ca ta logues and plan s. In November 1953 s am ple copies 01 a ca ial ogu e 011 Be d Ca tt le H ousing wer e pr es ented to a mee ting of the Nati on al Advisory Co mmi tt ee , to i liustrate th e t yp e of materi al p ro- pose d for the co-o pe rative pl an ser- vice. Th e d raf tin g and printin g of th is mater ial h ad been sup er vised and fi nanccd by th e Ontario Agri cul tural Co llege. Tile mee ting stressed th e ne- cessity of all p la ns being app rov ed by t op animal auth or iti es and other spe- c ia lis ts so th at th e in teres te d age ncies wo u Id be co m mi tte d to th e job p rior to publicati on an d that publ icati on and linancin g be clea red throu gh b oth Fed eral and Pr ovincial Dep artment s of Agricultur e. Itw as agr eed th at the dr aftin g wor k be continued at th e th ree draftin g ce n tre s, that th e d r aft - in g stall meet to arr i ve at a unif orm basis of pro cedure and that th e En- gi nee ring Committ ee should continue wi th the prep arati on 01 the ad di t iorial cl asses 01 cat alogues with sup po rt i ng p la ns as proposed . At a meetin g of th e Ex ecutiv e o f th e Nati onal Advi sory Committ ee in A pril 1954 it was decided th at the Fed er al Gove rn m ent would und er - tak e to edit and publish th e plan cata log ues in English and Fren ch and IB

Transcript of CANADIAN FARM BUILDING PLAN SERVICE - CSBE-SCGAB · dard stall barns varying in size from 12-16...

Page 1: CANADIAN FARM BUILDING PLAN SERVICE - CSBE-SCGAB · dard stall barns varying in size from 12-16 stalls; 18-28 stalls and 30-60 stalls. Designs are shown for a single row stall barn

CANADIAN FARM BUILDING PLAN SERVICE by

J. M. Armstrong Member C .A.Eng .S.

Canada Department o f Ag riculture , Ottawa, ant.

The Canad ian Farm Building P lan Service was organ ize d to devel op an d prod u ce working drawings for the co nstr uctio n of farm service b ui ld ings a nd related la bo r sav ing eq u ipmen t and to present information o n th e design 01 se rvice bu i ld ings in rel at ion to management, labor requi rements a nd other factors affecting liv estock .m cl crop enterpri ses.

The Plan Service was initi ated a nd has been co-o rd ina ted by the N ation­al Committee o n Ag r icu l tu ra l E ng in­eer ing, m ad e u p o f agr icu l tura l en ­g ine ers from th e Fe d eral and Provin­cia l Departments of Agriculture a nd Ag ric u l tura l Colleges in Canada .

Ear ly Effort s to Dev elop a Plan Serv ice

T h e establish m ent o f a co-ordinated pl an service covering farm bu ild in gs a n d Iacili ties was recommended by the N ational Comm itt ee on Ag ri cul ­tural Engin eering a t the in augural meet in g o f the N .C.A.E. at Ottaw a in 1944 . This was envision ed in so me Cl ll<lrters as a co-opera tive excha nge of p la ns among Fe de ra l and P rovin ­cia l institutions..\ su b-co m m itt ee o n Fa rm Buildings was se t up by the N . C. A.E. to stu dy the problem of crea ­ting a plan se rvice a n d li ason was ma de wi th N ati on a l Housing, es ta b­li sh ed under the N ational H ou sing Act o f 1944.

The Farm Buildings Sub-Co m mit­tee met in 194 5 a t the Exper im ental Fa rm, Swift Curren t, Sask. , to co nsi ­d er ava ila b le far m ho us ing a nd ser­v ice bu ild ing pl a ns . Plans ado p ted incl uded five for far m houses, tw o lor farm workshops, two tor grain storage, two for ca tt le a nd ho rses, tw o for p ig­ge r ies and pl ans for ce rta in li vestock eq u ipmeru. It was proposed th at th ese p lans be redrafted a t th e architectu ra l o l'Iicc o f the Experimental Farms Ser­vice. To handle the work, three pos i­t ious were establ ish ed in the follo win g yea r, for t n is d ra fting office but were never Iillecl due to the ' scarcity of q ual ified d ra ltsiu cn and the ina qe­q uecy 01 salaries tha t cou ld be offered . By 1949, even with the limited sta ff time a va il a ble, fiv e hou sing plans had been drafted, together with pla ns lor two ge ne ra l purpose barns, a farm wo rk sh op, a brood er h ouse a nd th ree pi eces o f p oultry eq u ip m en t. These wer e not suHicient to start a pl an ser ­vice a n d no par ti cular funds we re ava ila b le for dis tribution o f these

pl ans. Jn 1949, some ten prelimina ry farm housing plans we re published under th e auspices o f the P r ai ri e Rural H ou sin g Co m mi tt ee su pported by th e Gove rn men ts of the Prairi e Provinces a nd Cen tral Mor tga e a nd Housing Corpora t ion . A n urgen t need lor far m ho using pl a ns had thus been partl y me t.

!I. N ew A pproacl.

1n 195 1 th e Eas tern Sec tio n o f th e N .C. A.£. se t up a su b-co m m ittee to collect and rep ort o n farm building plans ava il ab le in E astern Canada . Some '146 pI ans were co ll ected , of these 26 re lated to farm bu ildi ngs and 243 to ba rn s, as reported to th e Se­co nel Con fe re nce o f the N .C.A .E. h eld a t O ttawa in 1952. P r ovincial repre ­sentati ves a t the Conferen ce were asked wh at type of farm building plans were most urgentl y requ ir ed in each regio n . This indi cated the classes o f se rv ice b u i ldi ng pia ns re­quired a nd tha t p la ns lo r farm h ous ­in g was n ot an urgen t probl em .

At th e 1953 meeting of the Western Section o f the N.C.A.E . it was pro ­posed th a t the prepa ra ti on o f servi ce build ing p la ns be undertaken o n th e ba sis ol eigh t se pa ra te classes o f build ­in gs wi th a su b-comm ittee for each class. A t a meeting of the Eastern Sec­tion of tile N.C.A.E., wh ich followed shortly , the E xecu tive of the N.C.A.E . named the nucleus of Pl an Commit­tees [or Beef Cattle, Dairy Cattl e, Swine, Sh eep, Poultry, G ra in Storage, Fruit and Vegetable Storage and Ma ­chinery Sto ra ge and Mi scel laneous, subsequ en tly designated Specia l Stru c­tures.

Ca ta log ues of pla ns p ub lished by the C a na d ia n Farm Buildin g Plan Service .

T wo m embers were a ppoin te d to each pl an co m m itteee, with power to add liv esto ck and other sp ecia lists, with a view to preparing a ca ta log ue of pl a ns cover ing thei r particul ar

class of bu ild ings. Drafting Service was to be provided at the Ontario Ag­ricultu ral College and the Experimen­ta l Fa rm , Sw ift Current. Subsequent a rra nge me nts were made lor drafting' to be done a t th e Cent ra l Lpcri me n ta l Fa r m thu s ma ki ng three d rafting cen­t res avail a ble.

S1IiJPort For Th e P rogram

The proposed program was su b­m i t red to th e Execu tiv e of the N ation­al Ad visory 'Com m it tee o n Agricul­tural Services, represen ting all Departments o f Agricul ture a nd th« Ag r icu lt ura l Colleges, in M a y 195;) a m i autho ri za tion secu re d to co lla bo­rate WIth representati ve A n ima l Hus­bandmen and o ther gro ups in co m ­p iling data wit h respect to the pro­posed buildin g plan service . By Augu st 1953 it was possible to report to the N ati onal A dv iso ry Com m ittee that nearl y a ll pl an corn rni t tecss had co m p le ted member ship arrangements, actu a l!y 1I10re th an forty persons were in volved, that p rogress had been made in t he assem bl y 01 plan materi al a nd tha t the Publ ications Committee had agreed to ce rta in drafting prac ti ces for the prepara ti on o f plan ca ta logues a nd plans. In N ovember 1953 sam p le cop ies 01 a ca ialogu e 011 Be d Ca tt le H ousing were presented to a mee ting o f the Nation al Advisory Commi tt ee , to i li us tr a te the typ e of material pro­posed for the co-o pera t ive plan se r ­vice . The d rafting a n d printing o f th is material had been supervised and financcd by the Ontario Agri cul tural College. Tile mee ting stressed th e ne­cess ity of all p la ns being approved by top a n im al author iti es and other spe ­c ia lis ts so that the in teres te d age ncies wo u Id be co m mi tted to the jo b p rior to publicati on and that publ icati on a nd linancing be cleared throu gh both Federal and P rovincial Departments o f Agriculture. Itwas agreed tha t the drafting work be co n ti n ue d a t the th ree drafting cen tre s, that the d raft­in g stall mee t to arrive at a uniform basis of procedure a nd that the En­gineer ing Committee should co n tin ue wi th the prepara ti on 01 the addi t iorial classes 01 catal og ues with su p port ing p la ns as proposed.

At a meeting of th e Executive o f th e Nati onal Adviso ry Committee in April 1954 it was decided that the Fed eral Govern ment would under­take to edit a nd publish the plan cata logues in E ng l ish and French a nd

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would finance the printing of the ini­tial plan seri es on the understanding that the di stribution of pl ans would be carried out through provincial or­ganizations. Thus, after a lm ost ten yea rs of effor t, official approval a nd fina nci a l su p port wa s secured for the Canadian Farm Building Pl an Service.

Pla n Catalogu es and Su p p orting

Plan Preparat ion

Su pport for the progr am ga ve im ­peLUs to the preparation of mat erial for the third Conference of the N.C. A.E. held at Macdonald Coll ege in June 1954. This meeting re ceiv ed re por ts on the work of the e igh t plan comm ittees, suggestio ns for improve­ment of pl ans; worked au t procedures for th e drafting centres; discussed the matter of revisions or maintaining of up to date material and learned from the Information Service of the Canada Department of Agri culture that provision had been made where­by th e Department would pay for printing a nd di stribution of ca ta ­logu es to a central office in ea ch Province ; would underwrite the cost of printing the initial set o f pl ans a nd th at the plans would be made available to the provincial distribu­lion centres on order through the Information Service or directl y from the Distribution Division, Publica­tions Branch, Queen's Printer, Ot­taw a.

Copies of the first catalogue prin ­ted, tnat of Beef Cattle Housing and Equipment, were distributed in quan ­tity to all Provincial Departments of Agriculture in May 1955 and the first order for plan sets was received by the Information Service on June 14, 1955. The six pl an catalogues printed to June 2, 1958 total 170,000 cop ies of which over 100,000 copies of these catalogues have been distributed to Provincial offices. Approximately 400,000 copies of the plan se ts for these ca ta log ues have been printed .

Reproduction copies of the ca ta ­logue on Sp ecial Structures ha ve been reviewed by Provincial Departments and the fin al manuscript is being comp leted . Material for the ca ta log ue on Grain Storage ha s been drafted and the manuscript is re ad y for pre­paration of reproduction cop ies for circu la t io n and approval prior to printing. The preparation phase for all proposed pl an catalogues is thus practically completed and a r range­ments have be en made for su pervision and drafting of material for future revisions at the Ontario Agricultural College.

Th e Plan Catalogues and Plan Sets

The following ma y serve to indicate the extent a nd type of information available in th e various catlogues.

1. B eef Callie H ousing and Equipment

This ca ta logue con ta ins a selecti on of pl ans fo r two de signs of loo se ho us ing barns, a two-storey barn with overhead sto rage a nd a closed barn with gro u nd sto rage. Three styles of ca tt le sheds a re depicted with feed lot or corra l and 21 pieces of beef cattl e eq u ipme nt.

2. Dai ry Cal ti e H ousing lind Eq u ip m ent

This catalogue is divided into two sections, one section deals with stan­dard stall barns varying in size from 12-16 stalls; 18-28 stalls and 30-60 stalls. Designs are shown for a single row sta ll barn with 12-lfl s ta lls and a genera l purpose barn with 4-10 stalls. A milk house a nd two types of silo are al so shown .

The second sectio n presents de­signs for loo se housing barns in size ranges of 12-1 8 cows, 18-28 cows , 30 cows a nd 30 to 40 cows a long with a design for a milk ing room unit a nd bull housing with ya rd. In add itio n, some 12 pieces of dairy ca tt le equip­ment are illustrated.

3. Swin e H ousin g and Eq u ipm ent

Danish and Canadian hog barns are shown in sizes su ita b le for 100­120 market hogs and a gen eral pur­pose barn for sows a nd feeder hogs. Three types of colony houses are shown. Two types of sun shades are shown and some 25 items of feeding and other labor saving equipment.

4. Sheep Housing an d Equipment

Designs are shown for a round roof sheep barn of 400 sheep capacity, a gable roof barn for 300 sheep and a pole barn with 14' bents each su ita ­ble for 40 shee p and a winter's su p p ly of ha y and stra w. Inexpen sive feed ­ing she ds and lambing she lt ers are depicted together wi th sheep yards, corrals and pens. Som e 20 it ems of sheep eq u ipme nt are sho wn. including d ipping tanks, feeders, a nd wool handl in g eq ui p me n t.

5. Poultry Hous in g and Equip ment

This ca ta logue contains designs for a one-storey laying house for 1700 birds; a two-storey house for 4000 birds and a four-storey laying house for 6800 birds, together with sm all er laying houses for 1000-2000 birds and a cage laying house for 1600 birds. De­signs are a lso given for a sla ned floor

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laying house, a rigid frame house for 1000 birds and a laying house for 400 birds. A two-storey broil er house is shown ; barns and sheds for turkeys, colony houses and a range she lter. There a re designs for II items o f poultry eq u ip me n t and d esign s lor ven tila tio n systems.

ti, Fru it and Veget ab le St o rages

and Eq uipmenl

This ca ta log ue contains designs for fru it packing a nd storage buildings in sizes su itable for 100-200 to ns of fru it, a bank type potato storage lor 11,000 bu shels and an abo ve grou nd pot ato sto rage for 35,000 bu sh el cap­ac ity . A 3,000 bu shel fruit and vege­table storage is shown, tog ether with a design 1'01' a basement storage, a walk-in cooler and freez er and venti­.la ion systems for storages. Three it em s of equipment are depicted .

7. G ra in St orag« «n d E r/l/i p"II'nl .

When ava ia b le this catalogue will co n ta in designs for approximately ~O

types and sizes of storage, su ch as, sma ll portabl e and permanent gran ­erics, circu la r pl ywood gra ne r ies in 22,000, :rJ ,OOO and 44,000 bu shel capa ­city, driveway type storages ; gra in sto rage build in gs convertibl e to ma­ch ine or an ima l shelter and 5000 a nd 10,000 bushel crib type farm elevators. Also shown will be va rio us types of co rn cri bs, a drive-through storage and a com bina t io n corn storag e and dryin g building of 2,500 bu sh el ca pa ­city, together with temporary types of grain storage and locations for sto­rage loading' and unloading eq u ip­men t.

8. Sj)e cial Stru ctures and j';qui!J1nelll

The final catalogue in th e series will con ta in some ten plan categories. including three desi gns for motor vc ­hi clc sto rage, a closed fram e and pole typ e m achinery sto rage and work ­sho p and a fuel lank she lte r. Then: will be two de signs for honey houses, tobacco build in gs suc h as a kiln a nd a pack barn and tobacco handling eq u ipme n t. Small a n im al buildings such as kennels, mink and fox pens will be show n as well as pl ant gro wth build in gs o f the gree n house type, with hot beds and cold frames. Design s will be sho wn for other facilities such as a sep t ic tank, a cis te rn and a drain ­age outlet. In addition, designs will be shown for some J4 i tems of equip­ment for fa rmstead and gro u nds im ­provem ent varying from swings to tr ellises, picnic tables, and an inciner ­ator with spark arrestor, a shed lor gardc n tools. a work bench, a breeze­way and a fence style.

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From the a bo ve lis ting it is evide n t that the Pl an Service cov ers a com­preh ensive ra nge of designs tor farm service buildings and associ ated eq ui p ­ment. In ad d ition each ca talogue con tains a section dealing with man­agement fac to rs tor the parti cul ar class of buildings in r ela tio n to fea­tures of building de sign and selectio n 01 eq u i pillen t .

Dist ribution of Plan Service Material

Some contusion ap pears to exis t ill respect to publi c distribution of catalogues and plans. This has b een due to a statem ent in the Iirst Lour ca ta logues pu b lished, th at is, Beef Callie, Dairy Cattl e, Sheep a nd Fruit and Vegetable Storage that ca ta logues ma y be had from Ex pe r ime nta l Farms or th e Canad a Department o f Ag r i­cultu re, Ottawa. This statement has been ame nded in th e Swine a nd Poul­tr y H ou sing ca ta log ues to read "cop­ies of this catal ogue I1 Iay be had fro m Agricultural R epresentatives of P ro­vin cial Departmen t of Agr iculture". The reason for thi s cha nge is th at each Provincial Department o f A gri­cul tu re e ither inse rts a su pp lemen t or preferably sta Illps the ca ta log ue with a statement on how and where to

ord er pl an s with in the particular pro­vince. Any ca ta logues that are to be made available to the Publi c through Federal Agen cies shou ld be so st amped by the Provincial Depart­men t of Agricul ture.

R euision of Plan Se rv ice M aterial

As indicated , a rra ngeme n ts have been m ad e fo r th e work of revi sion for the eight classes of plan ca ta log ues to be su pe rv ised by the on e remain ing d raftaing cen tre a t the Ontario Agri ­cultural Coll ege. It is anti cip ated th at rev isions may proceed at the rate o f one or two ca ta log ues per year by inse rt ion o f add itiona l sheet s in th e catal ogues where thi s is practical or a rev ision of t he ca ta log ue when nec­essary. T he drafting cen tre sta ff have, in rec en t weeks, met with represen­tatives of Provincial a nd Fed eral De­partrnen ts of Agri cu Iture to di scu ss various details of the pl an ser vice including th e demand for specific plans, add itio ns , del eti on s a nd revis­ions. If th is work goes accord in g to plan the mat erial p resently ava il a ble sho u ld be broug h t up to da te every four to Ii ve yea rs .

In concl us io n, th e development of

th e Ca na diau Fa rm Building Piau Service has proceeded by four to five yea r stages . Early e fforts from 1944­1949 to esta b lish th e serv ice Iai led to secure sufficient su p p ort to launch a co-ordintcd program of far m hou sin g period from 1951 to 1954·, a r ed irec­tion of emp hasis on farm service buildings on ly wi th m ore complete coverage for the proposed plan ser­vice gaine d widespread su p port due to th e improvements in th e proposed pl an an d possibl y that the times we re more rece p tive to th e id ea. ] n a ny event, offic ia l sanct ion and I'i­u an cial su p port we re forthcom ing. In the peri od 1955-58 all e igh t pro­posed pl an catl ogu es and plan sets hav e been prepared . Six of these have been published and it is ant icipa ted that the two remaining ca ta log ues will be ava ilable bv the end of 19!"j R or early 1959. '

T he ta ct that ava il able pl an service material has had reasonably wide­sp rea d public di st r ibution has, in th e opi n ion of many, a m p ly ju stified th e est ab lishment of the serv ice and has gi ven cons idera b le gratifi cation to the Na tion al Com mit tee on Ag r icu ltura l Engi neering and a ll those associa ted wi t h t lie clcvc io p rneu t.

(Co ntinued from page 5)

most su i ta b le. In trace r application s moderat e penetration and high detec­tion ef fici ency arc ge nerally d esirable ; in th is case radioactive isotopes em it ­tiug J3-rays a re o fte n used,

U uits an d M easu re ments

A beam of x- or g-ra d ia tio n is me a­sured by its ab il ity to ionize air. The pro pert y mea sured is ca lled th e ex­[iosu re d ose, a nd th e unit is the roen t­gen . Cru dely spe aking, a rotengen of x-r.ulra t io n g ives ris e to one e lectro­sta t ic unit of ionization in each cu b ic cen ti meter of a ir. R otengens are a meas ure or th e rad iati on it self, not wh at it d ocs in, say, ti ssu e.

The biol ogical effe cts of radi ation a re assumed to be gov erned by , among o the r things, th e amount of energy ab sorbed per unit mass a t th e p lace of interest, i.e., uy the absorb ed dos e.

One unit of absorbe d dose is the rep (ro te llge ll-eq u iva lent-physical ), defin­ed as the am ount of ene rgy absorbed pe r gra lu of tissue ex po sed to one rot engen o f x-r adiat ion. Th is co rres ­ponds accord ing to the most recen t values of certain constants, to abou t % e rgs/gill. Unfor tu na te ly different authors hav e used diflercnt va ria tions of th e a bove definition, and values of

84 and 93 erg/gm a re com mon in li t­eratu re. This con tusio n has been re­so lved by ddiniug a new unit, th e rad , wh ich is unambig-uou sly eq ual to 100 erg / gm .

R ads (a nd reps) ca n be a p p lied to electrons and neu trons as well as to x- and g-r ays.

Exposu re d ose in roentgen s is de­terrn in ed eithe r by a free-a ir cham be r, in whi ch the ionization in a well de­fin ed volume o f ai r is measured . o r fr om th e ionizati on in a sma ll a ir ­filled cavi ty surrou nde d by walls re­sem bling ai r in compositi on. A bsorb­ed d ose ca n be det e rmined in a vari et y of way s. In p r inciple an a t tractive method is to me asu re the ri se in tem­perature d ue to the ene rgy abso rbe d in a sm all, isolated volume of th e medium, but in practi ce th e dilficul­tie s a rc ve ry g rea t. T he ion ization in a sma ll gas- fille d cav i ty at th e point of in terest ca n be interpreted in terms of a bsorbed dose. The exposure dose ou ts ide the medium ca n be measured and th e absorbed dose at a point with in dedu ced Irom the kn own be­ha viour of th e radi at ion in the ma­terial. Other method s depend on the blackening of film, che m ica l cha nges in a vial of sol u t ion, a nd th e change in co lo u r o r specia l kinds of g lass. These latte r methods depend on pre­viou s ca li bra tio n against a devi ce cap­

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able of ab solute measurement.

T Le sh ielding o f ra d ia tio n so u rces '0 tha t th ey d o not harm th ose using th em a lwa ys requ ir es considerati on . G-l'ay so urces re q u ire the most shield­ing, since the ra ys a rc pentrating a nd arc euii t tc d con tin uo usly in a ll di re r­tions, ,B-rays ca n be sto p ped com plete­ly LJ y a thi ckness of mat erial eq ua l to th e ra nge . Acce le rators present Icwcr pro blems, sinc e the rad iation is ge ll­erall y emitted in a direct ed beam , a nd the mach ine ca n be turned o ff when not in usc.

Finallv, a few words a bo ut th e a mou n ts' of ra d ia tio n invol ved ill typi ­cal ap p fica t io ns m ay be helpful. l n tracer work it is o nly necessa ry to ha ve enoug h radiation to d et ect , and a few millionths of a roen tgen can he detect ed qui te readil y. Ou the othe r hand mos t irradiat ion effec ts req u ire somewhere bet ween a le w th ousand and sever a l m il lion roe n tgens. (Sprou ­ting in pot a toes is most effectivel y prevented b y a n ex pos u re to twenty th ousand ro en tgens.) T h e d anger level to man Jics between th ese two ex ­trernes: it is bel ieved that he ca ll be exposed to a te n th of a roentgen every week of hi s lile without noticeab le harm, hut 50() ro entgen s a t o ne ti me will k i II hi Ill . In this resp ect men an: evidently more sens itive th an pota­toes .