88 Captain Kater on the comparison of 
Shuckburgh : it is of brass, and about the same dimensions 
as General Roy’s scale, which is already well known. It has 
three parallel lines drawn upon it lengthwise. On one of the 
exterior lines marked E, are two dots expressing the length 
of the Tower yard. This is the yard which has been here- 
tofore called, and which I shall still call, the Royal Society’s 
standard . The middle line has the Exchequer yard marked 
upon it; and the other exterior line has dots, at precisely the 
same distance as those of the Royal Society’s standard. 
Knowing that Mr. Carey had made for Lieutenant Colonel 
Lambton, a standard scale, which forms the basis of the 
Trigonometrical Survey carried on by him in India, and aware 
of the importance of ascertaining the value of this in parts of 
other known standards, I enquired of Mr. Carey whence it 
was derived, and was informed that it had been copied 
from a scale then in the possession of Alexander Aubert 
Esq. and which, after his death, was purchased by Mr. Jones, 
of Holborn. On application being made by the Commissioners 
of Weights and Measures to Mr. Jones for the loan of it, 
their request was readily and obligingly complied with. 
This scale is of plate brass, strengthened by an edge bar : 
it contains 61 inches, and has the name of Bird upon it. Two 
dots upon two gold pins designate the yard, from which the 
divisions of the scale have evidently been derived. There is 
also a third dot, marking, I believe, the length of the French 
half toise. The dots indicating the yard are those I employed. 
I shall call this scale Colonel Lambton’s standard. 
Bird’s Parliamentary standard yard of 1758, had already 
been compared with Sir George Shuckburgh’s scale by him, 
and recently by myself, and found to exceed it about two ten- 
