L. E. KNOTT APPARATUS CO., BOSTON 144 … No. 27-276 27-275 PULLEY DEMONSTRATION APPARATUS. The frequent call for a complete outfit for demonstra tion of pulleys and the application of the principles thereof to wheels and axles and capstans has led us to design and assemble the above-illustrated combination. As may be noted, the instrument…
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
