1859                Address Unknown, New York, New York.

Sylvester W. & Washington L. Pearsall were recorded in an announcement on February 5, 1859 in the Evening Star (Washington, D. C.).  Patents week ending February 1, 1859.  Sylvester W. Pearsall and Washington L. Pearsall, Of New York, New York.—For photographic vise. No. 22,822.

Sylvester W. and Washington L. Pearsall are recorded in American Photographic Patents The Daguerreotype & Wet Plate Era 1840-1880.