BARREL AND TANK SPRAY-PUMPS. 
277 
with an air-chamber surrounding the cylinder.'- Thus, although the 
outside casing of the air-chamber may become accidentally bent, that 
of the cylinder within is protected against such injuries. Also this 
construction gives such pumps a more compact form, rendering them 
simpler and stronger. The pump is shown in section in Plate XLI1, 
Fig. 2, where h is the handle, b the solid piston in the cylinder with a 
guide-cap. c, at its top, incurrent valve below, and excurreut valve, J, 
to the air-chamber, e y which surrounds the cylinder as shown. A stiff 
discharge-tube, a, penetrates this chamber from its top to near its base, 
while its upper part has a horizontal tube, nt, from the cylinder, as an air- 
vent, which also communicates with an overflow-pipe,*, extending down- 
ward on the outside of the air chamber. In cheap pumps made of thin 
sheet-metal this protection of the working cylinder by an air-chamber 
encasement is certainly a very good plan. The air-chamber ma) tit as 
though it were a bung in a large hole through a fixed or removable 
head or septum of the vessel, and attachment by a llange or otherwise 
is easily (-outlived. 
The Ht'hnccle Spray pump is of the same description with slight mod- 
ifications consisting chiefly in placing a lever upon the piston, and tine 
overflow-pipe inside of the air chamber as patented in No. 200-14S, July 
30, LS7-S, by Mr. F. A. llelmecke, of Round Top, Fa) ette County, Texas. 
This pump is illustrated in longitudinal section in Plate XLII, Fig 1. 
The lever, c, is linked (jc) to a pivot above the discharge spout and works 
the plunger, in the cylinder, a. Below is a suet ion -strainer and valve, 
v o. Higher is an outlet valve, d, to the air-chamber, s, and discharge 
spoilt,/*/, while much higher is the overflow -pipe, c /", extending down 
through the air-chamber. Being entirely round on its outer surface 
the pump is readily inserted in a large bung hole of t he barrel or poison 
receptacle and is thus held while being worked. 
A pump having its cylinder protected by an air-jacket was also made 
and used in Fayette County, Texas, at about the same date as the lat- 
ter in an apparatus which has been thus described by Professor Riley: 
"THE YeaGER SPRINKLER. — This is :i sprinkler invented by Mr. George Yeager, of 
Flatonia, Tex , (patent No. 204410, May *2S, 187b). Plate LIV, Fig. 0, is a- part seo- 
tional suit- view, and Fig. 7 a phi in view thereof. 
" It consists of a plat form, A, upon which is laid a barrel, II, containing the poisonous 
liquid. A rubber hose, C, connects this barrel with the bottom of a pump cylinder, 
D. This cylinder is supported on a step, A 1 , and its upper end held in a brace, A-, 
attached to a standard, A :t , which rises from the platform, A. E is the pump-plnnger, 
connected to a lever, F, which is pivoted in the upper end of the standard, A 3 . The 
liquid poison is forced out through the sprinklers, G G G, which are three in number, 
and throw the -water in a line mist over three rows of cotton. A rubber hose, I, is 
attached to each of the spouts, II, of the pump to form connection with the sprinklers 
G for the purpose of lengthening or shortening the spouts, especially the two on op- 
posite sides of the pump, and of detaching and cleaning the sprinklers. The upper 
end of the pump-cylinder is left open and a spout or tube, J, is connected thereto to 
conduct the liquid, which would otherwise he wasted, back into the barrel. 
"The connection of this waste-pipe with this machine is the only point which is 
