146 



THE POPULAR SCIENCE MONTHLY. 



is usually expanded from four to eight times. The Leavitt compound 

 en seine is shown in Fig-. 21. 



Fig. 21. Leavitt's Pumping-Engine, 18T5. 



In this engine the lower ends, A, 7?, of the two cylinders are 

 brought close together under the centre of the beam, thus shortening 



. 



\ ::: - ' V :--:... .- , ..>.. 

 



;.. . : . . 



;>.\v> > WX X-;- . . W :-: WXi- ;->N>:s\v 

 :: :-. :-. v:W : . . I . - : :-. -: 



v--^w- Vvv .>; SSN^--:-;--: :- ; .-:-* 

 . : ,::-: . ' : K-.- ' 

 .,-:..'' -:.. .;. 



^-^ ; __ 







.... 

 ^ :::: . ___ --- w ::.;. :-:-. ..<,-.: - - -- K - sn^SS^ "" 







Fig. 22. The Woktiiington Compound Pumping-Engine, 1870. 



