Contributions to Physiological Technique 



367 



II. A New Form of Bellows-Recorder. 



The bellows-recorder introduced by Brodie/ while capable of yielding 

 the most admirable results, has in ordinary practice disadvantages well 

 known to those who have worked with it, in particular the difficulty of 

 making it air-tight in the first place and maintaining it so afterwards 

 without stiffening its joints. The volume-recorder here described is of 



Fig. 6.— Two 



Jiie It IS seer; troiu abovi 



with the cover and recording-lever thrown back. In the upper one the 

 loose open end of the condom has not been cut close off. 



very easy construction in a range of sizes suitable for a number of purposes, 

 and does not tend to leak. Its air-chamber is readily renewed when 

 required, consisting merely of a few centimetres of the closed end of a 

 readily procurable tube of thin rubber (condom).^ 

 The apparatus is shown in fig. 6. 



1 T. G. Brodie, Journal of Physiology, xxvii., p. 473, 1902. 



2 Renewal is, however, not often necessary. Made with condoms of good red rubber, 

 I have had recorders in good condition for as long as two years. 



