156 



SUMMARY OF OUllRENT RESEARCHES RELATING TO 



The apparatus (fig. 35) consists of a spherical copper boiler A, sup- 

 ported on three legs, and having a water-gauge a, a steam exit pipe 6, 

 which is fitted with a stop-cock, opening two ways, and a pipe c, into 

 which fits a funnel with a very long stem. This serves both for pouring 

 water into the boiler, and also as a safety-valve. The funnel is connected 

 with the boiler by means of a caoutchouc tube. The funnel B is fitted 

 with three tubes, one through which the steam enters, and another 

 through which it passes out. The diameter of the latter is less than 

 half that of the former. The third tube is for a thermometer which is 

 fixed by means of a cork bung. 



It is necessary to plug the aperture between the rims of the copper 

 and glass funnels with a piece of flannel in order to prevent the steam 

 from escaping. 



Paraffin Oven with simple arrangement for maintaining a constant 

 temperature.* — Dr. E. Sehrwald describes a simple apparatus for heating 

 paraffin, which is easily made and keeps a constant temperature. 



Fig. 36. 



It consists of a copper box (fig. 36), from the top of which ascends 

 a tube for filling with water, and a second smaller one descends for the 

 reception of a thermometer. When the box is filled with water the 



* Zeitschr. f. Wiss. Mikr., v. (1888) pp. 331-4 (1 fig.). 



