182 



THE ROYAL SOCIETY OF CANADA 



•H- V i 



rvon STAa- 

 HYDHOGCN COMPRESSOR 



Fig. 1 



with steel piston rings. The gas is cooled after each compression by 

 means of a number of inter-coolers immersed in a tank of running 

 water. The compressor is constructed so as to prevent any loss of 

 gas, and with this end in view the piston rods are provided with special 

 stuffing boxes in which the packing is sealed with oil holders. The 

 space back of each piston, as well as the safety valves, are so arranged 

 that they connect with the gasometer, and through the latter to the 

 intake of the compressor. The compressor has a capacity of 60 

 cubic metre of free gas per hour, and requires a motor of 30 H.P. to 

 operate it when delivering at 200 atmospheres pressure. Twenty 

 litres of water per minute are disposed of by the inter-coolers. 



We propose compressing the helium by means of a standard two 

 stage Whitehead air compressor (Plate I, 2) that has been modified for 

 use with rare gases (Plate I, 3). These modifications were made by 

 completely enclosing the crank case with three castings electrically 

 welded to the frame to which plates are bolted (Fig. 2). When the 



