PROCEEDINGS OF SECTION I. 



TAPES. 



613 



The best appliance for measuring the girth of the chest is a tape 

 somewhat over 1 meter in length graduated to millimetres. The tape 

 may be of inextensible linen, waxed or varnished, or of steel. The 

 former will be found easier to work with, though the latter has the 

 advantage of never stretching. 



SPIROMETERS. 

 Spirometers are of the gasometer 

 (Fig. 6) or Simplex types. 



Fig. 6. 



The approximate prices of approved types of instruments are : — 

 1. Personal weighing machines — 



A. Spring balance, with seat (Fig. 1) . . 



B. With loose weights and height standard (Fig. 2) 

 With loose weights and without height 



standard 



