Himataya Mounrains, 9374 
15. ‘Tue remainder of the apparatus, consisted of a plummet and tripod, 
for marking the point on the ground, where the measurement left off, and 
allowing it to be found readily the following morning. Fig. 10 is a 
representation of this. ‘The piece A B being moveable in the direction 
of the groove a b, and also turning readily on the screw ¢ as a centre, 
was easily brought into that position, in which, a notch cut in the piece of 
ivory, d, should correspond exactly with the wire of the plummet suspend- 
ed in water, and hanging from the tripod of a theodolite, placed in advance 
of the rod. ‘The distance of the wire from the rod was determined by. 
means of an ivory scale. This plummet was also useful, when it became 
necessary to rise or fall at the commencement of a new hypothenuse. 
16., Tur flags which were used to align the base, and the pickets which 
were put down to mark every 500 feet, had nothing remarkable or requiring . 
description. The flag staff (fig. 11) 482 feet in height, which marked one 
extremity of the base, consisted of two pine spars perfectly straight, and 
joined together by means of an iron collar. It had four braces to set it 
truly perpendicular, which was done by means of a plummet weighing two 
pounds. When adjusted, the stress was on the braces, and not on the 
stags. 
17... Turse comprised the whole of the apparatus used, with the excep- 
tion of the boring telescope, which was one, having a power of about six, 
with cross wires. ‘The theodolite mentioned in the account of instruments, 
was used in determining the inclination of the several hypothenuses—the 
observation being made on both faces, and the circle in the alignment of the 
