A Study of the Diet and Metabolism of Eskimos. 



17 



was therefore made of a framework of wood covered with large plates 

 of painted compoboard. These were put on with a large number of 

 screws and tightened by rubber 

 bands and by means of a special 

 substance known under the 

 technical name of ruberine. 

 Windows were provided in 

 front and on both sides. The 

 entrance was effected through 

 an air lock sufficiently large 

 to hold one person, and a 

 smaller lock (about 1 cb. foot) 

 served for the introduction of 

 food etc. To guard against 

 the possibility of the internal 

 doors of the locks being opened 

 by the subjects without per- 

 mission or order these doors 

 were connected with an electric 

 signal. 



In the chamber was placed 

 wet and dry bulb thermometers 

 which could be read through 

 one of the windows. The air 

 was sucked out through two 

 IY2 inch openings placed on 

 opposite walls one near the 

 floor and the other at the ceil- 

 ing. The two pipes led to a 

 cylindrical vessel of about 301. 

 capacity where the currents 

 were mixed and surplus of 

 water vapour condensed. A 

 short tube also of 1 У2 inch dia- 

 meter connected this vessel 

 with the gas meter. The meter 

 was an ordinary 50 candle wet 

 meter, the drum of which was 

 carefully calibrated to take 4 

 cb. foot per revolution. It could 

 be read to 1 cb. foot. A con- 

 stant level was maintained 

 throughout by means of a fine 

 jet of water and an overflow opening. The shaft of the drum was pro- 

 longed and provided with a large pulley, and the meter worked as a pump 

 Ы. 2 



Fig. 8. The gas sampUng apparatus. 



