728 CATALOGUE OF GRAPHIC ART EXHIBIT. 



Frame 124.— Process of J. W. Osborne.— ^os. 815-822, from wood- 

 cuts and eiigraviugs (No. 819 an example of extreme reduction); the 

 American Pbotolitliographic Company, New York. 



Frame 125. — Architectural .subjects from pen-and-ink drawings : Nos. 

 823, 824, 827-829; the Heliotype Printing Company, Boston. No. 820; 

 Robert Wehjke, New York. l^o. S25, from an etchinr/ ; the Heliotype 

 Printing Company. No. 830, half-tone process transferred to stone; the 

 Heliotype Printing Company. 



Frame 126. — ''Ink photos:^ — These photolithograplis, executed by 

 Sprague & Co., London, according to an undescribed process, show a 

 grain similar to that in the work of Paul Pretsch. All the specimens 

 are from nature, except No. 841, which is from a drawing. 



3. COLLOGRAPHIC PROCESSES. 



In these processes the affinity of the gelatine, after due preparation, 

 for fatty inks is utilized, and the printing is done from the gelatine fllm, 

 acted upon by the sun, mounted upon a glass or metal plate. They owe 

 their name to the fact that the printing is done from some glutinous 

 material {kolla, glwe). Hence, also, they are often spoken of as "gela- 

 tine printing." 



A great variety of names is given to the products of these processes, 

 heliotypes, phototypes, Albertypes, autotypes, artotypes, Indotints, etc. 

 Their designation as "photogravures," whicli is also met with, is mis- 

 leading, as this name belongs by rights to the intaglio processes only, 

 the collographic processes being surface processes. 



Frame 127. — From engravings and draicings. — No. 842, "heliotype," 

 by the Heliotype Printing Comi)any. Nos. 843-845, " Lichtdruck," by 

 Albert Frisch, Berlin. Nos. 840, 849, and 850, "Albertypes," by the 

 Forbes Lithograph Manufacturing Company, Boston. No. 847, "photo- 

 type," by the Boston Photogravure Company. No. 848, " artotype," by 

 Harroun & Bierstadt, New York. 



Frame 128. — From black andichite oils and. icatcrcolors. — Nos. 851- 

 853, "Albertypes," by the Forbes Lithograph Manufacturing Company. 

 Nos. 854-858, "phototypes," by the Boston Photogravure Company. 



Frame 129. — From oil paintings. — No. 859, " heliotype," by the 

 Heliotype Printing Company. No. 860, by Charles Taber & Co., New 

 Bedford {see also No. 893, on Screen 12, in corridor.) No. 861, " photo- 

 type," by F. Gutekuust, Philadelphia. Nos. 862 and 864, " phototypes," 



