Scientific American, Vol. 66, No. 15 (April 1892)
A weekly issue of Scientific American, published by Munn & Co. in New York in April 1892 for inventors, engineers and patent-minded readers. The wood engravings show machines and mechanisms in three-quarter view — a belt-driven shingle mill, a Smith Premier typewriter, a keyed adding machine, sectioned plane and cutter details — drawn in dense crosshatching with cast shadows and cropped backgrounds.
