BARREL AND TANK PUMPS. 281 



cyliuder a, and this has an upward discharge spout, ee^ dosed above 

 at p. This aud the standard, /, are joined to a flange, iij which is 

 screwed to the tank cover. There are two pistons, pp, hinged one 

 to either arm of the pump-lever, which has its fulcrum, z, upon the 

 standard,/. Thereby are simultaneously and oppositely operated the 

 two excurrent valved pistons in their respective cylinders. 



A pump after pL-in No. 2, having a single-headed reduction piston, 

 was patented by Mr. K. Eamsden, April 24, 1860, in No. 28012, but no 

 sample jmmp involving this principle haij yet come to my inspection. 

 The displacement capacity' of the upper half of the piston is one-half 

 that of the lower half, which works through a packing, fixed in a sep- 

 tum dividing the i)ump into upper and lower chambers communicat- 

 ing by an upward valve. The construction is an odd one and may 

 yet prove serviceable. 



The counterpart of the latter type is found in plan No. 3, in the 

 reduction-cylinder pumps, which have on the same rod two piston - 

 heads, the upper one of half the capacity of the lower, while the upper 

 part of the cylinder is only one-half as large as its lower part. A 

 large number of these are now patented and being manufactured for 

 wells, yet few of suitable size and Aveight for use in tanks or barrels 

 have come to my notice. The patent on the reduction cylinder has ex- 

 pired, while the recent improvements are in minor details. Among 

 the pumps of this group available for insecticide apparatuses is one of 

 simple construction and very durable as now made by Messrs. Eumsey 

 & Co., of Seneca Falls, N. Y., under their catalogue name, ^^J^ew Style 

 Force pump ^'^ and another which is really the same thing under a differ- 

 ent name, viz: the ^'Improved Douhle-acUng Suction and Force-pump ^^'' as 

 described in the sale catalogue of Messrs. W. & B. Douglas, Middle- 

 town, Conn. These pumps of smallest size cost from $L0 to 812. One 

 of them is shown in Plate XLY, Fig. 3. The suction-pipe, 7v, is to be 

 inserted through the head or cover of the barrel or tank, and its flange, 

 /, can be screwed down firmly. An extension hose or stiff pipe may 

 be used to prolong the suction -tube to the base of the reservoir, where 

 an ordinary suction-straiuer vshould be added. The upper or narrow 

 half of the cylinder, c, is surrounded by a swollen bulb or air-chamber, 

 a. From the base of this is formed the discharge-way, x y^ having a 

 goose-neck spout, y z. The hose may be coupled to the end, z^ or in 

 place of the neck, at y. Since the piston-rod has two bearings in its 

 two heads, its joint, ;, is essential. It will be seen that the whole is 

 a very strong pump, also serviceable in cisterns or wells. Since the 

 second or upper piston-head takes the place of a cap and packing the 

 pump is in no way complicated, while the air-chamber, in addition to 

 its double action, renders the discharge more constant. 



The following list mentions kinds of pumps wliicli are essentially the same as those 

 just described, but less compact in the arrangement of their parts, while they difier 

 i»ter se in several details of little importance in this connection. Though mostly 



