C 43® 3 
XX. An Account of the Trigonometrical Survey , carried on 
in the Tears 17 95, and 1796, by Order of the Marquis 
Cornwallis, Master General of the Ordnance. By Colonel 
Edward Williams, Captain William Mudge, and Mr. Isaac 
Dalby. Communicated by the Duke of Richmond, F. R. S. 
Read May 11, 1797. 
PART FIRST. 
PREAMBLE. 
According to the resolution expressed in the account of the 
Trigonometrical Survey, printed in the Philosophical Trans- 
actions for the year 1795, we now communicate to the public, 
through the same channel, a farther relation of its progress. 
On referring to the above paper, it will be found that, for 
the prosecution of this undertaking, a design was formed of 
proceeding to the westward, with a series of triangles, for the 
survey of the coast. This intention has been carried into 
effect ; and as the small theodolite, or circular instrument, an- 
nounced in our former communication as then in the hands 
of Mr. Ramsden, was finished early in the summer of 1795, 
we are enabled to give a series of triangles, extending, in con- 
junction with those before given, from the Isle of Thanet, in 
Kent, to the Land’s End. 
In the composition of the following account, we have ad- 
hered to the plan adopted in the last, of giving the angles of 
