Scientific American, Vol. 26, No. 11 (March 1872)
A weekly issue of Scientific American from March 1872, published in New York by Munn & Co. for inventors, engineers, and patent-minded readers. Wood engravings show patented apparatus in three-quarter view — a rotary filter, a pressure cylinder with hose, a sewing machine treadle mechanism, a lamp throwing lettered rays — useful for hatched metal shading, machine silhouettes, and small trade-mark devices.
