500 
The Account of a 
art. ii. Triangles for ascertaining the Distances of the Eddy stone 
Light-house, from the Flagstaff of Plymouth Garrison , and the 
Ram e-head. 
The ball on the lantern of the Light-house was observed from the 
stations on Butterton, Kit Hill, and Carraton Hill ; and as much un- 
certainty has heretofore existed, with respect to a knowledge of its 
true distance from any point in the neighbourhood of Plymouth, 
observations were made on various arcs of the circle of the instrument, 
at the two first stations. 
The triangles are the following. 
Distance from Butterton to Kit Hill 100969 feet. 
No. 
Triangles. 
Observed 
angles. 
Distances of the stations from 
the intersected objects. 
3°3 
Butterton 
Kit Hill 
Eddystone Light-house 
Distance from Butt 
0 , n | 1 Feet - 
66 46 21 H Eddystone Light- f 1121159 
64 27 46|j house - - ^123399 
:erton to Carraton Hill 131576 feet. 
3°4 
Butterton 
Carraton Hill 
Eddystone Light-house 
60 5 31 
55 52 41 
"1 Eddystone Light- f 
j house - 
121158 
126863 
With the distance of the Eddystone Light-house from Kit Hill, 
and also that of the Flagstaff in Plymouth garrison from the same 
station, we find the distance from the Light-house to the Flagstaff 
= 73061 feet;* the observed angle being 29 0 42' 34": and, comput- 
ing with the data obtained from the last triangle, and the 223d, 
• On referring to the late Mr. Smeaton’s Narrative of the Building of the Eddystone 
Light-house, it will be found, that, from a trigonometrical process, founded on two bases 
measured on the Hoe, among other deductions, he concluded the distance between the above 
objects was 73464 feet ; being 403 greater than the distance found by the above computation. 
