Angle Trisection Different Modes
Ancient Egyptian Astronomy -Sarah Symons 1999 Thesis
Astronomy Positional FV APM Rev3_1
The Pendulum and the Cycloid by Huygens -81v_cycloid
Method of Dividing Astronomical Instruments by Edward Troughton
John Bird 1709-1776 Mathematical Instrument Maker in the Strand by C. D. Hellman