( 519 ) 



No. LXXV. 



Defcription of ii Speedy Elevator. By the Inventor, N i c n o- 

 LAS Co I. LIN, D. D. with two drawings from a model, 

 reprefenthig it folded and 'wound up. 



Read before the Society, and the Model prefented, on the 2d December i jyi ; 

 honoured with the Magcllanian gold Medal in December 1795. 



TH E main body of the bafe is a redangular Iblid 

 floor. (Fig. F. W. in the plate.) To its corners are 

 jointed four horizontal legs, of equal thicknefs with it, but 

 half the length, having their nether fides even with its 

 bottom. When the machine is ufed, thefe are difplayed 

 fo that their ends form a rectangle ; the diagonals of which 

 may be on thofe of the main body, or vary from them in 

 a pofition moft promotive of ftability. 



The pillars A A ftand vertical on the long diameter of the 

 bafe, equally diftant from it? ends. Their feet enter into 

 it, and are by the ftrongeft fattening incorporated with its 

 body. Thefe pillars are pairs. Their form is a rectangu- 

 lar parallel ipiped. Their inner fides have grooves from top 

 to bottom : which terminate by offsets in cylindric feg- 

 ments. Near the tops are central embrazures, whofe fides 

 are fortified with iron plates that reach within the folid 

 parts above and below. The pulleys are of metal, with 

 fteel axes and brafs naves for eafy turning, and deep chan- 

 nels for fecuring the cords. 



The pillars are joined by three pairs of ribs. Thefe are 

 reftangular ; wide, but comparatively thin j placed hori- 

 zontally, between the tops and embrazures, about the 

 middles, and near the feet. Their ends are clofely fitted 

 within the pillars, and well fattened. 



The piers B B are more flender than A A ; with fliorter 

 heads; but the length of their bodies is equal to the 



whole 



