New York [etc.] Simmons-Boardman Pub. Co. [etc.] · leaf 260
ing. .Vs w ill lx> -.cen, above a comjiound horse shoemagnet is suspended a card board >.eale i)an holdingthe watch. The thread supporting the pan is twisted,and as the watch is slowly removed from the magneticfield by raising it, the thread is allowed to untwistitself. This very simple…
Railroads · Railroad cars
Internet Archive · Carnegie Library of Pittsburgh · Public Domain Mark 1.0. Free to use for anything.
