IOO 



BRONDGEEST'S SPHYGMOG11APH. 



and S', S', Uphani's capsules) are pierced in the middle by thin metal tubes, whose free ends 

 are connected with caoutchouc tubes, K and K'. All the four metallic vessels are covered with 

 an elastic membrane. On S and S' are fixed two knob-like pads, p and p' y which are applied to 

 the pulsating arteries, and the metal arcs, B and B', retain them in position. On the other 

 tambours are arranged the writing-levers, Z and Z'. Pressure on the one tanibour necessarily 

 compresses the air, and makes the other, with which it is connected, expand, so as to move the 

 writing-lever. This arrangement does not give absolutely exact results ; still, it is very easily 



Fig. 76. 

 Scheme of Brondgeest's sphygmograph. S, S', receiving 

 writing levers, Z and Z' ; K, K', conducting tubes : p, 



; and recording (S, S') tambours with 

 over heart, p', over a distant artery. 



used, and is convenient. In fig. 76 a double arrangement is shown, whereby one instrument, B, 

 may be placed over the heart, and the other, B', on a distant artery. 



(8) Landois' Angiograph. To a basal plate, G, G, are fixed two upright supports, p, which 

 carry between them at their upper part the movable lever, d, r, carrying a rod bearing a pad, 

 e, directed downwards, which rests on the pulse. The short arm carries a counterpoise, d, so 



Fig. 77. 

 Scheme of Landois' angiograph. 



as exactly to balance the long arm. The long arm has fixed to it at r a vertical 

 rod provided with teeth, h, which is pressed against a toothed wheel firmly fixed 

 on the axis of the very light writing-lever, e,f, which is supported between two up- 

 rights, q, fixed to the opposite end of the basal plate, G, G. The writing-lever is equilibrated 

 by means of a light weight. The writing-needle, k, is fixed by a joint to e, and it writes on the 

 plate, t. The first-mentioned lever, d, r, carries a shallow cup, Q, just above the pad, into 

 which weights may be put to press on the pulse. In this instrument the weight can be measured 



