8 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 8l 



The melikeron was clamped in a vertical position at a convenient 

 height (about i m.) and remained unchanged throughout the work. 

 The subject stood or sat in front of the instrument so that the part 

 of skin or clothing exposed was al)0ut 5 to lo cm. from the shutter. 

 In the first trials, water directly from the tap was circulated through 

 vestibule and shutter. The difiference in temperature, however, be- 

 tween the surrounding air and the shutter and vestibule produced a 



Fig. 2. — Thermoelement device for measuring surface temperatures. 



F — Fibre rings. 

 S- — German silver frame. 

 ]V — Wooden handle. 



P — Spring steel projection 

 [/—Silk thread. 

 T — Thermoelement. 



Cu ^ 



Fig. 3. — Diagram of electrical connections of copper-nickel thermoelement. 



G — Galvanometer. 



T — Thermoelement junction. 



C — Constant temperature junction. 



convection effect which altered as the shutter opened and closed and 

 introduced an error resulting in too large values. Fifty feet of block 

 tin pipe was then coiled and placed in a tank of water kept at room 

 temperature. The tap water passed through this just before entering 

 the instrument. Mercury thermometers measured the temperature of 



