NO. 6 



BODY RADIATION ALDRICH 



the circulating water before entering the vestibule and after leaving 

 the shutter. The mean was used as the shutter temperature. 



For the direct measurement of skin and clothing temperatures, a 

 special device was prepared with the help of Mr. Kramer, the Ob- 

 servatory mechanician, and embodying Dr. Abbot's suggestions. The 

 device is shown in figure 2. It consists of a specially mounted copper- 

 nickel thermoelement of fine drawn wire. A frame of German silver 

 is bent as shown in the figure and fastened in a wooden handle, W. 

 Two silk threads are stretched to form a cross between the four 

 spring-wire posts, p. The thermoelement wires are fastened sym- 



FiG. 4. — Bath for constant temperature junction. 



Th — Thermometer. 

 D — Stirring device. 

 A'. — Kerosene bath. 

 V — Vacuum flask. 



metrically to these silk threads with the junction straddling the length- 

 wise thread. The wires lead out through fibre rings, F, and through 

 the wooden handle. The copper wire (see fig. 3) leads through a 

 switch to a sensitive type Leeds and Northrup D'Arsonval gal- 

 vanometer and thence to the constant temperature junction in a stirred 

 kerosene bath as shown in figure 4. The Cu-Ni wires are sufficiently 



