BARREL AND TANK SPRAY PUMPS. 
279 
tanks or barrels. For the latter purpose the base-pipe, x, is inserted 
through a hole in the cover aud extended by a piece of suction-hose or 
metal pipe bearing a suction-strainer in the bottom of the reservoir. 
The base-flange, y, is then screwed down firmly upon the cover- The 
cylinder, z, is of larger capacity than is necessary for spraying, making 
harder labor than need be with pumps specially adapted for small sprays. 
The long lever, /, needstobe worked slow, but with much strength. Upon 
the discharge-spout, s, is an air-chamber, c. The discharge may be taken 
from the cock, ft, at the base of the air-chamber, or from a hose attach- 
ment at the top, n. The latter is of special value in elevating liquid to 
fill a barrel or tank, while the cock may prevent Biphoing through the 
pipe when the machine is not being operated, rumps of this general 
character, and of the smallest sizes now offered, retail at from 810 to $13. 
The simpler so-called " Wheel borrow force p urn pe n and " Truch-ichceled 
or Garden-engine pumps" are of this same general typ*. These parties 
also sell the same styles of pumps having side lugs whereby to attach 
them against the vertical side of aboard, frame, or wall. Allied to the 
latter are their" Wind mil! pumps/' which have no lever or a removable 
one. These cost a little more, but may be used to better advantage 
where the pump is to be worked by machinery. 
In a .similar way may be employed the smallest sizes of certain stand* 
aid pumps of essentially the same form as that shown in Plate \LV, 
Fig. 1. They have a crank attachment between the lexer and piston, 
whereby the short arm of the lever is inside ot the top of the cylinder, 
which is enlarged as an air-chamber, having on top a cap that is not 
perforated by the piston rod, and these pumps are know n as M The 
Lotus pump" of Mr. W. S. Hlunt, LOO Beekman street, Xew York, u The 
potent Pendulum force or lift pump," manufactured by .Messrs. w. ft B. 
Douglas, of Middletown, Conn., and "the / inter pump" of Messrs. Rum- 
iey & Co., Seneca Falls, N. Y. Their prices range from $10 upwards. 
M The Lotus" has. besides t he side-spout, a straight waterway from its top. 
The small u Counter pumps" "or Ale mid Beer pumps" of these niann- 
factnrers can be used as simple, cheap instruments, throwing intermit- 
tent jets and not giving very great power. They cost So to $8. 
Those of the above-noticed pumps which have an air-chamber get 
thereby a discharge that is less intermittent, and, although they are, 
somewhat constant-acting, they are not true "double-acting" pumps, 
but sometimes erroneously bear that title. 
[Double-acting Force pumps proper.] 
The double acting force-pumps proper, with or without air-cham- 
bers, throw a more constant stream, and hence are the best as tank or 
barrel pumps for supplying continuous jets of spray. They generally 
discharge from above the piston-head. In these, as a rule, the up- 
ward stroke produces a suction, filling the cylinder with the liquid. 
The downward stroke displaces all this from beneath the piston-head, 
