Meafuremcnt of a llafe on FIoutiilow-He?ithi 4 -71 



"the ninety-eight feet of coffering, \vhich was kept fo mucli 

 :lhort of the hundred feet, that its extreme parts might not reft 

 upon, or even touch, the central ftands. To that on the left of 

 the center was attached the apparatus for the firft or zeroend of the 

 chain ; and to that on the right of the center was attached the 

 apparatus for the lafl; end oi the chain. When the fecond 

 chain length had heen meafured off, the firll: and fixth of the 

 coffer ftands of the firft chain were moved forward to prepare 

 for the third chain ; and the four remaining coffer ftands w^ere 

 raifed, until their furfaces came into the fame plane with the 

 flide flands, for the reception of the glafs rods,- The fpace by 

 which thefe ftands were raifed was about three inches; for fb' 

 much higher was the furface of the Interfole or flooring of tho 

 coffers than the ftands which fupported them. 



The apparatus attached to the firft end of the chain, or that 

 which ferved to pull it back to the point of commencement, 

 while a weight continued fufpended at the farther end, con- 

 fifts of two parts, as may be feen by referring to the left-hand 

 f'fide of tab, XVII. Firft, a fmall wooden frame, fitted to flip 

 on to the top of any one of the ordinary ftands, placed imme- 

 diately to the left of that which fupports the handle. Secondly, 

 ' a flat fteel rod, about two feet in length, wherein a number of 

 rholes are pierced, about an inch afunder, for the reception of 

 a fteel pin placed in one of the holes, as beft fuits the diftance 

 of the ftand from the handle. That end of the fteel rod 

 neareft to the end of the chain is formed into a fcrew about 

 four inches in length, 'and it receives upon it a forked hook 

 fitted to lay hold of the ftraight part of the handle of the chain. 

 Within the forked hook there works a ftrong milled-headed 

 brafs nut, which ailing upon the bottom of the fork, the chain 

 is thereby pulled back, until the wire fufpeading the plummet 



from- 



