4l-i A. L. Day and J. K. Clement — Gas Thermometer. 



ments for ice and boiling-point determinations before and after 

 each heating. The photograph (fig. 2) sho\vs the furnace 

 body lowered in this way, leaving the bulb free and completely 



Fig. 2. 



Fig. 2. Photograph of the gas thermometer and accessory apparatus. _ The 

 gas thermometer measurements contained in the present article were finished 

 in May, 1907. The photograph was taken in July, 1908, after certain details 

 of the apparatus had been changed preparatory to measurement of much 

 higher temperatures. The photograph therefore differs in certain minor 

 details from the diagram (fig. 3) and from the description contained in the 

 text. The apparatus is shown with the furnace open and ready for the ice- 

 point determination. 



