

r 



-re mark*! off with ml paint >., 

 ,'th. At signal earn man slacked 







Itbiml waitiiiK' f--r orders, he 



n. at the i 

 :- aihiMiiitf th- 



thr main ; 



<t a 



. canal. The pontoons were swung 

 .....I the blocked fleet of 



II<1 .AIM. 



that something had gone 



I/UP- 

 it Mveral lengths did not rest upon 



rrr,t this, th, 

 resorted to an ingenious and somewhat 



thr tu.mH. -Iriven by watrr power, ainl be de~ 

 cided lo pomp tbe water . itt fi by MM 



of 



that * 



in the whole length of pi|* 

 to swing a few inches, and ao 

 M-if. Thr Uftinf power of the ris- 



t runted to d<> . tbe men 



tck away when tbe word was 

 Iv thr Boatinj; pontoona rote with 

 d ai soon aa the point was rea< 

 idency to BwinK ?hr h..|,|- 



m the whole , 

 taalf gently into position, tin signal 



ropes were cast off, the long pi IMS 



its bed, and the mlju-t- 

 > be j developed, 



Minn* pi- - ' "f fii-in.-.-riii- jij.j.. :ii-s 

 doe to MrM>. W. II. Hrn.ll. -y and 



il V ir is not enjoying 



<listril>uti<>!i .f |I,.\\,T MM the 



itiri'S. In 



.ige Canal 



ipffveaora force air at work 

 pipes 9 or 8 miles long, tlistn I >ut- 



route; i' 



naare also maile with small engines 

 onaDorposes on tbe works. Pn u- 

 r appliances hare been 

 mple and convenient, and are com- 

 tto nae. As a refrigerating metlium 

 ret soils, wh t.. 



hula, com pr eased air bas bean 



.in 



nost remark able disooTeries in thi> 

 one apparently destined to rrrv 

 most familiar marhinrry 

 inanu- 



'. "air lift." It was 

 <i 1884. 



in ing operations in 

 n under bis management 

 and at the 

 ,5 shaft b^ 



I with water, wh: I* pnmj- <i 



air compressor was available outside 



. In th. 



mm i .-i 1 - 



apparalu* wa* 

 tUal the 



/ H : 



net ween 



not at first introduced. An iron box.* A 

 an upward opening valve. B. in it* bottoti. 

 cbarg< i m I I>. an air \-i\- y which the 



compressed air was forced downward into the 



Tbe box was lowered nearly to the bottom 

 of the shaft, and the romprsssid air forced u at 

 the top until nearly all tbe water contained in 

 the box was driven out through tbe discharge 



whence it fell into a ilrain. and ran out 

 of thr tunn.-l. Tl le b exactly the earn* 



as that of the familiar water i|hon. or like the 

 less popularly familiar contrivance need by 



-is in I* I -oratories, known as the Bersrlio* 

 washer. This simple apparatus worked w*U 

 enough until a leak developed m t! 

 releasing part of tbe compressed air, which made 

 a considerable disturbance in tbe surroondmff 

 water. Thi* prove*! to be one of those lucky ac- 



s that lead to important discovery. In- 

 stead of stopping altogether, tbe flow of water 



ued from thedirge pipe in iliiutoisbiii 

 volume at a height of 65 feet above tbe leaky 

 box. ami Dr. PohK's curiosity was natural^ 



! .-, -. ,.-i ::., . ' : . ' 



two pipes, as shown at F. the new pipe being 

 prorfiidwitb an air cock. Wbm all as raadj 

 the compressor was started and the cross con* 

 nection Opened. a.lmiiting a 



near tbe surf a* 

 > result was a largely 

 violent discharge of water at the top of tbe pipe. 

 It was further found that tbe expenditure of 

 power by the compressor pomp could be largely 

 ndnced: while the dfaohMM of water si 



creased in volume, though the air pressur* was 

 .If what was required beforr the leak de- 



the box. 



This discovery called for reconstruction and 

 resulted in what is now known aa the - Air lift." 

 A discharge pipe with a Ml mouth at it* end is 



well aix! firmly flxeilther. 

 its mouth a far below the surface of the water 



