Scientific American, Vol. 5, No. 20 (November 1861)
A weekly illustrated journal of invention, patents and mechanics issued by Munn & Co. in New York in November 1861, written for inventors, machinists and general readers. Its small wood engravings combine sectional views of furnaces and mill machinery, part-by-part mechanism drawings, and line diagrams of circles and angles, all keyed with italic letters and "Fig." labels, giving designers hatched brickwork, gear teeth and technical lettering.
