426 Miijor-General Roy's Account of the 



guefts, and the numerous vifitors whom curiofity drew to the 

 fpot, met with the moft hofpitable fupply of every necefl'ary 

 and even elegant refrefhment. It will eafily be imagined, how 

 greatly this tended to expedite the work, and how much more 

 comfortable and pleafant it rendered the labour to all who 

 obligingly took part in it ; but more efpecially to him, who, 

 being a volunteer in it at firft, confidered himfelf as bound to 

 perfevere in his beft endeavours to bring it to a fuccelsful con- 

 clufion. 



From the defcription that has been given of the deal rods, it 

 will be remembered, that they are fitted to be applied in mea- 

 furing, either by the coincidences of lines, inlaid one inch and 

 a half from each extremity, or by the conra<51:s of the fphcrical 

 lips of the bell-metal with which they are tipped^ The firfl", 

 feeming to be th^ mod accurate, although the mofl tedious 

 method, was that by which we propofed to fet out. 



The flag-ftafF having been previoufly removed from the^ 

 pipe, and the brafs cup filled with water put in its flead, all 

 the necelTary precautions being likewife taken for preferving 

 the line of dire£lion, horizontally, by the rope ftretched along 

 the firft hypothenufe, and vertically, by means of the bonuig 

 rods ; the firft ivory line on the firft rod was brought by the 

 plummet to coincide with the center of the cup,- in which, 

 pofition, being clamped, it accurately marked the commence- 

 ment of the bafe. The fecond rod being now applied to the 

 firft, and moved up by the apparatus formerly defcribed (tab* 

 XVIII.) till its line coincided with that on the firft; and, in 

 like manner, the third rod being applied on the alternate fide 

 of the fecond, moved up and clamped as the reft; thus the 

 exaft.diftance of fixty feet was afcertained, care being always 

 taken, that the firft adjuftments were not difturbed, while the 



iiibfecj^uent 



