532 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
water which passes into the spiral B, where it is heated to a given tem- 
perature by a Bunsen burner provided with an automatic regulation of the 
Fig. 69. 
A 
gas supply. By means of the stop-cock H the rate of passage of the 
hot water to the hot stage, and consequently the temperature of the latter, 
can be conveniently regulated. 
Reichert’s new Cover-glass Measurer.* — With this instrument, 
represented of half its natural size in fig. 70, the most exact measure- 
Fig. 70. 
ments of O' 01 to 8 mm. can be quickly and conveniently made. The 
clamp b, in which the cover-glass to be measured is fixed, is opened by a 
slight pressure upon the lever a. 
Sir David Salomons’ Electric Lantern. — The following figures f 
represent this lantern as shown by Sir David Salomons at the May 
Meeting of this Society (see ante, pp. 383-4, 424-6). Fig. 71 shows 
the instrument with the polariscope on the right and the Microscope on 
the left. Fig. 72 gives another view with the Microscope on the right, 
and also showing the third front. 
* Reichert’s Catalogue No. 18 (1892). 
t We are indebted to the Camera Club for the use of the cliches. 
