UNITED f STATES wrriLiAM- D; ANDREWS `To allgwhom itmy concern: t'

l Be it known that LWILLrnM D. ANDRnws, `of the city, county,.a`n`d State of New York, have inventeda newand] useful Improvement in Reciprocating Pumps; and I do herebyr de` l clare thatthe following isa full, clear, and exactdescriptionofthesame, referencebeng had to theaccompanyingdrawings, making a part of this specilication,in}which A Figure 11 isalongitudinal central section of .my`inventiou, taken inlthe line a: `:v,`Fig.2;I1"ig. ;2,a transverse s on'of the same,taken inl the line y y, Fig.` A A Y Similarmletters of reference indicate corre` sponding partsfinthetwo gures. A A

This `invention,consists in .the employment of acompoundqpiston{orone provided with `twovalvesty opening "in opposite directions in "right line and `usedlin connection with a `ater-tightpartitionor abutment placed with 4,inthe pump-cyli erfand in such relation with thetworpiston-valves, the eduction or A. discharge opening, and avwater-passage communicating with Lthepumpcylinder, that by' a simple reciprocating movement ofthe piston each valve" `will `alternately propel the stream inj the 1same direction throughI the pump andeach valvednring its reverse move- A ment allow the stream to pass freelythrough it, therebvvoperatingwitli a moderate eXpenditure of power, r admitting ot'` a; rapid` movementwith butlittle wearand tear of the working parts, and raisingand forcing a large` volume ofwaterin-agiven-time; l To enable `those skilled in theartto fully "understand and construct myinvention, I will proceedtodescribeit. g

mpf cylinder having l A represents 3g/the pu `gwithinit a` water-tight partition or abutment,

`Brand Gis the piston-rod the piston of which isjformed'of twoparts, D, D', each of which isfprovided with avalve, E, -thevalves open- ',abutmentBJvhich is between them, as shown "clearly in FigiV `1. "lhe piston-rod C works `through the abutment B, and ball-valves are represented in the drawings; but other forms may beused.

v F is a water-passage whichis parallel with the cylinder Aand communicates with it at V opposite sides of the abutment B, and G is an "ing in oppositedirections or both toward the` y PATENT OFFICE.

,von New YORK, N. Y.

jlMPRovr-:D RECIPaocATlNG PUMP@ stiflmnn forming pmpf Lettrsrntenf. No.` 35,577. dated June 17,1862.

i "B atV theA side opposite to the suction end of the cylinder. y 1 H is the indnctionbpeningof the cylinder A, which communicates with the latter nearv Lone en'd of it, the abutment B being between the induction'. and eduction openings, but some distance from the former and by the side ofthe latter, as just stated.

:Thefoperation isf as follows: When a reciprocating movement is given the piston-rod C,

direction indicated by the arrow l, will be drawn through the induction-opening H Aas the valve of the part D of the piston closes and the suction end of the cylinder Alls through the passage Fand into the pump-cylinder at the opposite side of the abutment, and thence through the part D of the valve and ont through the eduction-openiug G. 2.) During the opposite movement of the piston-rod C, as indicated by arrow 3, the valve of the part D of the piston opens and the valve of the part D closes, and the part D draws the water through the part D and passage, F, and at the same time forces the water in front of it out through the eduction- .opening G. rlhus it-will be seen that the two `parts Vof the piston a'ct alternately, and a conpurpose herein set forth.

WM. D. ANDREWS.

Y Witnesses: A

J nii/Ins LAIRD,

eductionopeningwhich.adjoins the abutment R. GAwLnY.

`thewater,when the piston-rod `moves in the Y with water, while the water that is at the opposite side of part D of the valve is forced l (See arrows ftinuous stream is drawn through the pump B in the pump-cylinder A, the water-passageV F, and the induction and .eduction openings [-I` G, when arranged to operate as and for the