Scientific American, Vol. 61, No. 12 (September 1889)

1889 · 10 pictures

Resistance · Apparatus · Secured · Munn · Valve · Scientific American · Galvanometer · Electric light · Wheel governor · Horse power · Navy yard · Tangent galvanometer · Express money · Valve head · Eel skins · Three days

Internet Archive · Public domain (published before 1931) · More from this library