114 



is of no consequence, as it will be pumped out in the next stroke. 

 The whole piece being- connected with the receiver pipe and bar- 

 rel by screws, can with ease be removed and examined. Indeed 

 there is no part of the pump that cannot be readily got at, and in par- 

 ticular, the lower valve can be removed, cleaned, and replaced 

 during the exhaustion. 



By screwing on a pipe over the lower valve and connecting it 

 with any vessel, we have a complete condensing apparatus, and if 

 required, the air may be taken from the receiver, and transferred to 

 any other vessel. Fig. 1. is a perspective view of the pump, with its 

 barometer gage, &c. but it is obvious that it can be made of a much 

 eheaper construction. 



GEORGE KIERNAN. 



