Journal of Applied Microscopy. 



91 



APPARATUS. 



A New Thermo-Regulator. 



The Reichert's Thermo-regulator, as 

 commonly made, is far from being- satis- 

 factory. The small opening which 

 allows a minimum flow of gas sufficient 

 to keep the light burning is, as a rule, 

 entirely too large, consequently, for cer- 



Fig. 1. 



tain purposes, the minimum flame of 

 such a regulator is still too large and 

 gives, therefore, more heat than is neces- 

 sary. This objection is recognized by 

 many makers of instruments, and sev- 

 eral modifications have been devised to 

 permit regulation of the minimum sup- 

 ply. Some of these modifications are 

 unquestionably a distinct improvement 

 more or less, and thus will alter the 

 minimum supply of gas. The slender 

 inflow tube is very liable to break in 

 making connections or otherwise. It is 

 well known, moreover, that the average 

 thermo-regulator cannot be used for 

 upon the ordinary form. In some of 

 these types, unfortunately, the weight 

 of the rubber tubing atached to the 

 inflow tube will cause this to move. 



high temperatures (150°C.) as well as 

 for low temperatures (30°C.). It is 

 necessary to have two regulators, one 

 for high and the other for low 

 temperatures. 



The thermo-regulator which I have 

 had constructed, can be used for high 

 as well as low temperatures. This is 

 due to the large inflow and outflow 

 tubes, so that a minimum resistance is 

 offered to the flow of gas. Moreover, as 

 will be understood from the description, 

 the maximum inflow of gas can be 

 regulated by turning more or less the 

 part marked B in Fig. 2. The minimum 

 outflow of gas in like manner is regu- 

 lated by turning the part marked C. It 

 will be observed, furthermore, that the 

 rubber tubing is atached to strong lat- 

 eral tubes which are independent of the 

 regulating portion proper. 



Fig. 1 shows the thermo-regulator as 

 a whole, reduced in size. 



Fig. 2. 



Fig. 2 illustrates the construction of 

 the regulator. Part A is provided with 

 the two lateral tubes which have an 

 internal diameter of 6 mm., and has a 

 ground internal surface indicated by 

 the stippled portion of the drawing. 



Part B is ground to fit the preceding. 

 It is provided with an opening (1) 

 through which the gas passes into the 

 interior. The lower portion of B, oppo- 

 site the outflow tube, is ground on the 

 inside and has a small opening 1 mm. in 

 diameter (4). The neck above is like- 



