TURNTABLES. 



279 



A turntable of exactly similar make is now sold by 

 Messrs. Armstrong, of Manchester ; it is shown in Fig. 232. 



FIG. 231. 



Mr. Sidle exhibited, in 1878, at the Microscopical Con- 

 gress at Indianapolis, a turntable, which has since gone by 



FIG. 232. 



the name of the " Congress " turntable. It may be seen in 

 Fig. 233. 



Into the upper surface of the rotating plate, diametrically 



