Scientific American, Vol. 25, No. 21 (November 1871)
A weekly issue of Scientific American from November 1871, published in New York for inventors, manufacturers, and mechanics, reporting patents, machinery, and laboratory phenomena. The wood engravings mix hatched perspective views of boilers, bells, and lifting tongs with lettered sectional diagrams and a white-on-black plate of flame forms, offering mechanical parts, reference letters, and figure captions that can be lifted as isolated line elements.
