How to make pictures : easy lessons for the amateur photographer (1882)
Price, Henry Clay · New York : Scovill Manufacturing Co. · leaf 62
52 HOW TO MAKE PICTURES. over the surface of the plate, but not so much that the varnish will run off at the edge. Figure 21 illus- trates the act of pouring out the varnish. Incline the plate so that the varnish will flow to the upper right hand corner, vary the inclination, and send the varnish… … right hand corner. It will of course be surmised that the object of these movements is to coat the film on the plate over evenly with varnish. When the varnish has reached the lower right hand corner, the bottle should be placed as indicated by figure 22, so that it will catch the surplus varnish.…
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.