JOURNAL 



OF THE 



WASHINGTON ACADEMY OF SCIENCES 



Vol. VII APRIL 19, 1917 No. 8 



PHYSICAL CHEMISTRY.— A convenient form of autoclave. 

 George W. Morey, Geophysical Laboratory. 



The following form of autoclave has been designed after con- 

 siderable experience with autoclaves and bombs, and is believed 

 to be superior to commercial forms in ease of construction, in 

 manipulation, and in certainty of closure. 



It consists of three parts: a photograph of these separate 

 parts is shown in figure 1, and the assembled autoclave, in cross- 

 section, in figure 2. 



The cover, B, of the bomb, D, is held in place by being pressed 

 against a projecting rim, A', on the outer shell, A, by the bolt, 

 EE. Following is a detailed description of each part. 



The outer shell, A, is made from a p'ece of 4-inch standard 

 pipe. On the upper end a shoulder, A', § inch thick, is welded 

 with an oxyacetylene blow-pipe. Near the lower end of the 

 pipe two opposite holes, If inches in diameter, have been drilled; 

 their centers are 6f inches from the top. These holes are shown in 

 section in figure 2, and are more plainly seen in figure 1. 



Inside the outer shell is placed the bomb, D. It is made from 

 a piece of 3|-inch standard pipe, one end of which is closed by 

 welding on an iron bottom, as shown. The other end is closed by 

 means of the cover, B, the outer rim of which is pressed against 

 the rim, A', on the outer shell. 



Special attention should be called to the type of closure. The 

 washer, a ring of 0.8 mm. gold wire, is placed in the space, C, 



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