BARREL AND TANK SPRAY PUMPS. 279 



tanks or barrels. For the latter purpose the base-pipe, a?, is inserted 

 through a hole in the cover and 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 adai>ted for small sprays. 

 The long lever, Z, needs to be worked slow, but with much strength. Upon 

 the discharge-spout, s, is an air-chamber, c. The discharge may be taken 

 from the cock, 7v, at the base of the air-chamber, or from a hose attach- 

 ment at the tox), n. The latter is of special value in elevating liquid to 

 fill a barrel or tank, while the cock may prevent siphoing through the 

 pipe when the machine is not being operated. Pumps of this general 

 character, and of the smallest sizes now offered, retail at from $10 to $13. 

 The simpler so-called " Wheelharroiv force-pumps'''' and " Truclc-ivheeled 

 or Garden-engine pumps'''' are of this same general type. These parties 

 also sell the same styles of i)umps having side lugs whereby to attach 

 them against the vertical side of a board, frame, or wall. Allied to the 

 latter are their '' Windmill 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- 

 ard pumps of essentially the same form as that shown in Plate XLY, 

 Fig. 1. They have a crank attachment between the lever and piston, 

 \Yhereby the short arm of the lever is inside of the top of the cylinder, 

 Avhich is enlarged as an air-chamber, having on top a cap that is not 

 perforated by the piston-rod, and these pumps are knoAvn as " The 

 Lotus pump, ''^ of Mr. W, S. Blunt, 100 Beekman street, Kew York, " The 

 patent Pendulum force or lift pump,^'' manufactured by Messrs. W. & B. 

 Douglas, of Middletown, Conn., and ^' the Index pump''^ of Messrs. Eum- 

 sey & Co., Seneca Falls, K. Y. Their prices range from $10 upwards. 

 "The Lotus "has, besides the side-spout, a straight waterway from its top. 



The small " Counter pumps ^' " or Ale and Beer pumps ^^ of these manu- 

 facturers can be used as simple, cheap instruments, throwing intermit- 

 tent jets and not giving very great power. They cost $5 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, 



