Na. 129. 



91 



ions, the main wheel and the barrel, round with a multiplied 

 leverage, by which four men, standing in a small space round the 

 capstan, can raise more weight, without moving a foot themselves, 

 than four or five times their number can move, by wliat is nauti- 

 cally termed loalking round the capstan, that is, travelling round 

 pushing the bars in the drum-head before them. The form of 

 the barrel will, in most cases, compel the rope to " fleet" itself, 

 that is, work upward^ as it winds on, maintaining nearly an equal 

 leverage in work, and if it should by accident do this suddenly, 

 or as the seamen say, surge upwards, the men cannot be thrown 

 down by the foreshooting and recoil of the bars they are working 

 with, so that they work with an increased confidence, that greatly 

 facilitates their labor ; and all this is done without carrying the 

 spindle through the deck, as has be?n the common practice. 



A. W. GARY'S ROTARY PUMP. 



This marhine, for the 'purpose of raising and forcing water^ 

 has beta before the public since 1848. It was exhibited at our 

 last fair for the first time, and after an examination of its con- 

 struction, with the opportunity afforded of witnessing its opera- 

 tion, we think it fully justifies all that we have heard in its favor. 

 One of the principal merits of the machine is the simplicity of the 

 Method of packing so as to keep the chambers perfectly tight. 

 and at the same time friction, to a large extent, is avoided. It 

 is easily repacked when required, and we do not perceive In it 

 the usual liabilites to get out of order. Viewed as an ordinary 



