LOCOMOTION 



375 



Fig. 270. Arrangement of apparatus for measuring the 

 consumption of oxygen in walking (Jules Amar). 



The writer places his apparatus in a knapsack when the ex- 

 periment involves a walk of any length. Generally, however, he 

 avoids the necessity of carrying the measuring apparatus by 

 confining the walk to a distance of eleven metres only, which is 

 traversed a sufficient number of times to occupy three minutes. 



The general arrangement of the apparatus is shown in fig, 270. 

 On the table is placed the gas meter, together with an apparatus 

 with a two way connection, by means of which alternate samples 

 of the gases evolved, when the subject is at rest or in motion, can 

 be readily obtained (see also fig. 224). 



Kolmer and Brezina employed the Zuntz apparatus (fig. 269} 

 with a length of track of about 155 metres. 



