91 



A very simply constructed stand -- GlLTSCH's Drawing Stand, No. 116 



is specially designed for use with drawing prism, No. 109, and with the large 

 ABBE drawing camera, No. 111. This apparatus is adapted for lenses, Nos. 9 and 10, 

 as well as for various powers of spectacle -lenses. The details of construction 

 are plainly apparent from Fig., 50. 



No. 116: GlLTSCH's Drawing Stand: Marks 35. . Code-word: Pavia. 



Fig. 50. 



GILTSCH'S Drawing Stand, Mo. 116, and 

 Drawing Board, No. 115. 



P: drawing prism, No: 109; S: tube-socket for 

 attaching the ABBE drawing camera, No. Ill; 

 R^ and R,,: rings to hold lenses, Nos. 9 and 10. 



(V 5 Full Size.) 



B. Appliances for measuring and counting 

 microscopic objects. 



Measuring Apparatus. 



Micrometer Eye-pieces and Stage Micrometers. 



The requirements of measuring microscopic objects are in most cases 

 met by the use of simple eye- piece micrometers, i. e., of small glass disks 

 with divisions, which are dropped into the eye-pieces with the side bearing the 



