swan's atmospheric soda fountain. 
185 
I. A valve at the upper termination of the pipe H, opening 
downwards. 
K. A lead pipe connecting the pipe H. with the discharg- 
ing aperture L. of a forcing pump M. The cylinder of the 
pump is constructed of a composition of lead and tin or other 
suitable material, about i of an inch in thickness, two inches 
in diameter and 12 inches in length, with brass cap and boxes, 
a packing box N. at the top around the piston rod, a valve 0. 
in the piston opening upwards, and a valve P. in the bottom 
box R. opening in the same direction. 
T. A lead pipe attached to the lower box R. and passing 
into the reservoir W. placed in the cellar, or at a convenient 
distance in any other situation. The reservoir is a stone 
ware jar of sufficient dimensions to contain about 12 gallons. 
C. The ice tub, in which the fountain is placed and secur- 
ed; the divided half of a barrel will answer the purpose and is 
of a suitable size. 
The couplers connecting the pipes, as represented in the 
drawing, are of brass, of the ordinary kind, accurately fitted. 
The stop -cock is also brass, very nicely adjusted, and may 
be inserted in the pipe below or above the counter. 
The pump is secured by being firmly soldered to a metallic 
plate, and the plate fastened by screws to a plank placed per- 
pendicular, so that the position of the pump may be at a 
convenient angle for working, the plank secured at the top to 
the counter, and at the bottom to the floor. 
It will be perceived that the whole apparatus must be made 
in the very best manner, and nicely adjusted, as it is required 
to sustain a considerable degree of atmospheric pressure. 
The dimensions of the fountain and reservoir may be with 
propriety increased. However, those given will generally be 
found sufficient. 
Manner of using the Fountain. 
Prepare any of the varieties of syrup in the usual manner, 
and dissolve in each gallon of the same 7 ounces of tartaric 
acid; put into the reservoir any quantity of pure water which 
