div class=trans-pagebutton class=gotoPage data-page=1Page 1button div class=trans-imageimg data-url=document-facts-about-o-in-9th-century-baghdad-three-mathematiciansthe-banu-musa-brothersinventedhtmlpage=1 data-page=1 class=trans-thumb lazyload alt=Page 1: standleyhistoryweeblycom · FACTS ABOUT O In 9th-century Baghdad three mathematicians—the Banu Musa brOtherS—invented ingenious trick devices and puzzles that were like the loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mM8Uw8AAh0BTZud3BwAAAAASUVORK5CYII= data-src=https:reader030fdocumentsinreader030viewer20220411235d230a5088c993d0068ce5e0html5thumbnails1jpg width=140 height=200 divdiv