574 



JOHN E. MURLIN 



Milner. More recently calorimeters have been constructed at the Cornell 

 Medical College (Williams, H. B.) and at Bellevue Hospital (Riche and 

 Soderstrom) in New York. The operation of these calorimeters has been 

 under the scientific direction of Graham Lusk. The small calorimeter at 

 the Medical School constructed by Williams has a cubic capacity of ap- 

 proximately 480 liters. 

 This calorimeter was 

 .designed for the study 

 of metabolism in in- 

 fants and children as 

 well as of animals (Fig. 

 29). The large calo- 

 rimeter at the hospital 

 known as the Sage cal- 

 orimeter is designed for 

 the study of patients in 

 a reclining, sitting or 

 supine position and has 

 a cubic capacity of 

 1123 liters. Still larger 

 calorimeters on the 

 same ' principles have 

 been constructed by 

 Benedict at the Nutri- 

 tion Laboratory in Bos- 

 ton, having a capacity 

 large enough to accom- 

 modate a man doing 

 active muscular work, 

 and by Armsby at the 

 Pennsylvania State Col- 

 lege (Armsby and 

 Fries) designed for 

 measuring the heat 

 production of the larger 

 farm animals. 



The wall construc- 

 of these calorimeters. The inner 

 both sides, thus permitting of 

 In the cross sec- 



Fig. 25. Cross section of chair calorimeter of 

 Benedict and Carpenter. A, copper wall; B, zinc wall; 

 C, hair felt; F, asbestos lumber. At the upper right 

 hand corner of the figure is shown the ingoing and 

 outgoing pipes, below this at C the food aperture and 

 the ingoing and outgoing water pipes with their re- 

 spective thermometers. The chair is suspended from a 

 balance carried on the frame of the apparatus above 

 the chamber. 



tion is essentially the same in all 



wall consists of copper tinned on 



soldering, while a second metal wall consists of zinc. 



tion represented in Fig. 25, A represents the copper and B the zinc wall. 



Surrounding the latter and providing air insulation is a series of panels 



constructed of asbestos lumber lined with hair felt or with compressed cork. 



The whole construction, therefore, is more or less of the refrigerator type 



