Seltzer water . 
455 
the directions of Mr. Cloud in every particular, and in order to 
secure success, we procured two powerful screws, and an iron 
head ; the latter was adapted the moment the vessel containing* the 
chalk and diluted sulphuric acid was put in. 
Description of the apparatus .' —In order to understand the plan 
more fully, we subjoin the following figure, which may, probably, 
lead to some improvement, which would obviate our objections 
The vessel we had made, was of strong* oak, with staves of 1 § 
inches in thickness, of the figure of a churn, as A and contained 
about 18 gallons. At 6, is a partition made in the vessel, at the 
time it was formed. At c, is a hole of about two inches diameter 
with a wooden pipe r, to screw it in or out at pleasure. At d , there 
is a circular iron head made to fit on the top of the vessel A, under 
which is placed thick paper before the head is screwed on by 
the screws g. g At h , is a wooden piece made of thick plank 
perforated at the ends, so as to admit the iron bars e. e. which arc 
fastened to a plank at bottom k . k. At i. is an aperture fora stop- 
cock to let out the water. The distance from b» to the top, is about 
one-third of the length of the cask. 
The Operation . The vessel A, is filled with river water to 
within an inch of b. The pipe c. is then screwed in : a vessel of 
atone-ware holding about two quarts, is then provided, in which is 
put one pound of chalk in small lumps, and a*diluted mixture qf 
sulphuric acid in the proportion of 6 ounces to one pint of water. 
