42 B MajonOenerd'^oYS Account of the 



The meafuring rods, when put into the chefl: in London^, 

 had been compared and found to agree with the ftandard. The 

 comparifon was not repeated on the i6th; but this being done 

 on the I 7th, at 7 h. A.M. under the oil-cloth canopy at the 

 camp, they vvere found at a medium to exceed the ftandard by 

 one-iiftieth of an inch, the temperature then being 62°. After 

 the comparifon they were carried to the place of the fppod, 

 when the operation was refumed by bringing, with the helppfthe 

 plummet, the fame point of the rod v^ith which w^e had left off 

 work, to coincide wdth the interfeCtion on the brals ruler. The 

 meafurement of this day w^as clofed at the end of the tenth hypo- 

 thenufe, when the rods being carried back to camp, were com^ 

 pared, and found accurately to agree with the ftandard. 



A confide rable fall in the barometer, between the evening of' 

 the 17th and the morning of the 19th, portended rain. Ne- 

 verthelefs, all parties repaired to the place of rendezvous, 

 which was appointed at the lower end of the bafe, in order to 

 r£-meafure the two firft hypothenufes, by placing all the rods 

 in contact, which on the 16th had been done partly one way 

 and partly the otlier. The operation being according repeated 

 w4th great care, the point of the fixtieth rod, which formerly 

 correfponded to the center of the fecond picket, was now found 

 to be pufhed forward exaftly forty-five inches, anfwerable to 

 the deficiency on the fifteefi coincident rods, with which the 

 menfuration was begun, 'it now began to rain, therefore the 

 rods were carried back to camp, and being feverally compared, 

 they were found to exceed the ftandard each by one-thirtieth af 

 an inch, occafioned by the extraordinary humidity of the air. 

 A heavy rain enfued ; and vvhat made this much more regretted 

 by all was, that in the forenoon their Majefties gracioufly con- 

 defcended to honour the camp with their prefence,, and con- 

 tinued 



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