"1 Photoengraving direct from a Magnetic Spectrum on Glass, "The engraving herewith was made directly from a plate prepared by Professor Mayer. An example of the production of a relief printing plate directly from an original negative."--Hanson Collection catalog, p. 55
Forms part of the David A. Hanson Collection of the History of Photomechanical Reproduction
In: Scientific American, a weekly journal of practical information, art, science, mechanics, chemistry and manufactures, vol. 34, no. 16, April 15, 1876, p. 244 -- Title supplied by cataloger