CH. VI] 



LABORATORY TABLK 



205 



316a. Line drawings on the back of photographs. Repeated use of the 

 method for obtaining line drawings on the back of photographic prints during the 

 last four years has demonstrated its great usefulness. The artist or the amateur has 

 the advantage of the photographic image with its correct proportions and perspec- 

 tive, and is in no way hindered from adding free hand additional details, or artistic 

 touches. The enormous advantage of line cuts over half tones becomes apparent 

 with increasing emphasis with every book or scientific article published with half- 

 tone illustrations with their vagueness. Photography is a good helper, but should 

 not be made the master in getting scientific pictures. 



FIG. 125. Two MICROSCOPES AND A CHALET LAMP ox A LABORATORY TABLE. 

 (About one ninth natural size.) 



The Chalet microscope lamp with two windows (fig. 37) serves well for two 

 observers on opposite sides of the same table, or two tables may be placed side 

 by side and the lamp rested partly on each. 



COLLATERAL READING FOR CHAPTER YL 



ATWELL, W. J. On the conversion of a photograph into a line drawing. Anat. 

 Record, Vol. 10, pp. 39-41. The lines are rgade on the face of the photograph, 

 then the photographic image is bleached out by means of hypo and cyanide. 



COMSTOCK, J. H. The Wings of Insects, 1918. Blue prints were made and the 

 India ink lines made on their face. The blue was then bleached with po- 

 tassium oxalate, etc. 



GAGE, S. H. AND H. P., Optic Projection, Ch. X. 



HARDESTY AND LEE. Laboratory drawing. 



