246 



BACTERIOLOGY. 



The author's thermo-regulator *, shown in Fig. 37, is 

 intended to overcome the difficulties mentioned. Although, 

 apparently, more complicated than the ordinary regulator, 

 it nevertheless is easily adjusted and is extremely sensitive. 

 The gas tubing is attached to the strong, wide inflow and 



outflow tubes {a' and a") and is 

 thus independent of the regulat- 

 ing parts. The upper portion 

 consists of the three parts A, B 

 and C, the arrangement and 

 working of which is readily 

 understood from the illustra- 

 tion. The gas enters the inflow 

 tube a', and passes through the 

 opening &, into the interior of B. 

 On account of the stopper C the 

 gas cannot leave except by pass- 

 ing through the opening c into 

 the narrowed portion of B. It 

 leaves this delivery tube at the 

 lower end (/) and through the 

 opening d. The latter supplies 

 the minimum amount of gas 

 necessary to keep the lamp 

 burning. This supply can now 

 be regulated with absolute pre- 

 cision. The opening d is made 

 through the parts B and C. By 

 turning C, the opening through 

 this part becomes excentric to 

 that of B, and hence, the minimum supply of gas is thus 

 diminished. 



The delivery tube / should not be too narrow and 

 should almost touch the bottom of A. The first droplet of 



iCentralblatt fur Bakteriologie, 23, p. 1054, 1898. This instru- 

 ment can be obtained of Greiner and Friedrichs, Stiitzerbach i. 

 Thiiring-en. 



Fig. 37. The author's thermoregulator. 



