The Account of a 
43 2 
art. vi. Further Remarks ; and Reduction of the Base to the. 
Temperature of 62°. 
Remarks. 
It having been our wish, that some scientific persons should 
be present at the completion of the measurement, his Grace 
the Duke of Richmond was pleased to desire Dr. Maskelyne, 
astronomer royal, and Dr. Hutton, professor of mathematics 
in the royal military academy at Woolwich, to attend upon 
this occasion ; to whom Mr. Ramsden was necessarily joined, 
as his standard brass scale, and beam compasses, were requisite 
to conclude the business with the wished for accuracy. Ac- 
cordingly, on Wednesday the 28th of September the remain- 
ing three chains were measured in their presence ; and the 
horizontal distance from the end of the last chain to the axis 
of the pipe was found to be 21,055 inches, as determined by 
Mr. Ramsden ; and consequently the apparent length of the 
base was 274 chains, and 21,055 inches. 
The height of the last picket above the pipe was 35 inches, 
from which deducting the 5 inches of the rotten part, which 
was cut off, there remains 30 inches, or 2 \ feet, for the height 
of the last picket, above General Roy's pipe; which makes the 
whole descent 33,55 feet ; or about 2 \ feet more than was de- 
termined by the former measurement* 
