1893.] NEW-YORK MICROSCOPICAL SOCIETY. 81 



scope, made twenty years ago, of exquisite workmanship, having 

 no fine adjustment, but an excellent coarse adjustment ; also a 

 stage compressor of unusually easy operation. 



Mr. Leggett described his home-made dissecting microscope, 

 comprising adjustment for the lens, swinging mirror, and firm, 

 ample stage. 



President Shultz explained his greatly enlarged model of 

 Smith's vertical illuminator, which he had constructed for the 

 occasion, exhibiting plainly, at one view, to the entire audience 

 the operation of the apparatus. 



Mr. William Wales said that, in conjunction with Prof. Hamil- 

 ton L. Smith and Mr. George Wale, he was engaged during two 

 years in carrying out Prof. Smith's ideas of the vertical illumina- 

 tor. They made both forms — glass and metal reflectors. The 

 apparatus was patented by Prof. Smith and the patent was 

 assigned to Mr. Wales. 



Mr. George S. Woolman corroborated the statement of Mr. 

 Wales, and said the credit of the invention was due our country. 



Mr. Shultz stated concerning his exhibited metric scale that' 

 Prof. Rogers worked for a year over this admirable scale. It 

 was soon found that speculum metal afforded the best lines, and 

 the most uniform power for actuating the ruling machine was 

 obtained from a weight elevated high in the building contain- 

 ing the machine. 



Mr. Walker explained the method of cutting his sections of 

 spines of Echinus — the spines were thrust firmly into the holes of 

 ordinary pearl buttons, cemented in place with balsam, cut off 

 close to the buttons with a saw, and then spines and buttons 

 together were ground down to proper thinaess on successive 

 stones. Mr. Walker also described his automatic revolving stage 

 and polarizer, actuated by clockwork. 



Dr. F. D. Skeel explained with blackboard drawings his im- 

 proved attachment for moving the fine adjustment of the micro- 

 scope in photography ; the main point of which improvement 

 consisted in carrying the long, endless cord, at the side of the 

 camera, to a grooved pulley on the stand below the fine adjust- 

 ment, and then coupling this pulley with the grooved milled head 

 of the fine adjustment by means of an additional short, endless 



