Color-blindness in railway employees

• Book ID: 103088438
• Publisher: Elsevier Science
• Year: 1879
• Tongue: English
• Weight: 65 KB
• Volume: 108
• Category: Article
• ISSN: 0016-0032
• DOI: 10.1016/0016-0032(79)90286-2

✦ Synopsis

Co!or-Bli~dness in ]~aihvay .Em21oyees. 253 at much less cost than photographs. To produce the best results special negatives arc required to produce the printing plate, and care and skill is required of' the printer. The Artotype specimens exhibited before you to-night will, I think, convey some idea of the practical application of heliography.