Amateur mechanics ... a book for old and young who like to make things .. (1907)
Popular mechanics magazine, Chicago. [from old catalog] · Chicago, Popular mechanics · leaf 39
lMHTLAR MECHANICS … per hour increase for each second. Thus Ifthe thread moves one inch, it shows that thetrain is gaining 2 miles an hour each second. AN OPTICAL ILLUSION The accompanying Illustration shows ■ perfectly straighl box* I rule laid over ;i number <>f turned bi various klthougb tii« effect la the…
Handicraft · Amusements
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
