Furlong — Description of an Ariijicial Respirator. 493 
every point is therefore fully determined, since the particle at D moves 
v^ith the velocity of the cylinder. The Kinetic energy in the liquid is 
equal to that possessed by a cylinder of the liquid of the same size and 
moving with the same velocity as the cylinder which has produced the 
movement. 
XLI. — Description of an Instrument for keeping up Artificial 
Eespiration. By Dn. JN'icholas Furlong. (With Plates XXVI. 
and XXYIL, Science.) 
[Eead April 28, 1873.] 
The instrument I have used for keeping up artificial respiration was 
constructed by myself, and is a modification of one originally devised 
by my father. Dr. A. Turlong, of Streamville, Co. Wexford. 
Many years since it occurred to him when endeavouring to resusci- 
tate some persons asphyxiated by drowning, that an instrument simi- 
lar to what I have sketched in section, at fig. 3., ought to prove 
useful. 
He never had one constructed of sufiicient size to test its practical 
utility, but his model, which I have frequently examined, had the form 
of an ordinary pair of bellows, but with two compartments, each of 
which had a separate pipe or tube. 
It will easily be seen that when these pipes were fixed air-tight 
in either nostril, and the mouth and lips kept perfectly closed, that on 
divaricating the handles a d, the chamber A filled through the pipe 
P with water or air from the lungs, while the chamber B filled through 
the lower valve with fresh air. On again approximating the handles, 
the chamber A emptied itself through the upper valve, the chamber B 
at the same time transmitting its charge of fresh air to the lungs. 
Though the action of my instrument is essentially the same as 
my father's, yet it differs from it in some other respects. — First, in 
form, which is a matter of very little consequence. Secondly/, in having 
hut one pipe inserted into a third or central chamber C, communicating 
with the other two by means of apertures presided over by suitable 
valves. The importance of this for my purpose is obvious, the trachea 
being by far the most convenient part through which to carry on 
artificial respiration. Thirdly, in being self-acting in one direction 
through the agency of ela&tic bands, which enabled me to dispense 
with the services of an assistant, and keep it in full action by a treadle 
movement. Fourthly, in the idea of a regulating spring (Figures 4 
and 5, P]. XXYII., Science) over the valve Y (see Pig. 1, PI. XXYL, 
Science), to obviate the tendency of the air to pass directly from 
chamber A to chamber B. 
The regulator, fig. 4, would only be necessary in the case of large 
animals, where the resistance ofi^ered by the lungs was very great ; it 
