4 6 
Captain Kater’s account of the 
standards were repeatedly compared with Sir G. Shuck- 
burgh’s scale (the standard being placed upon the scale) 
when no perceptible difference could be detected. Pieces of 
card were now placed under the standard as before, without 
occasioning any appreciable alteration ; and I had thus expe- 
rimental proof of the perfect efficiency of the remedy I had 
employed. 
I have been thus particular in detailing the difficulties I 
experienced, because they exhibit a source of very consider- 
able error which may arise from the thickness of a standard 
scale, and which I believe has never before been suspected. 
It may be here not unnecessary to remark, that on every 
occasion on which I have used Sir G. Shuckburgh’s scale, it 
has fortunately been placed not only upon the same table, 
but upon the same part of it. 
The various standards which have been described in this 
paper with the exception of the yards with steel termina- 
tions are not meant for common use, but are intended to be 
carefully preserved, to be referred to only upon extraordi- 
nary occasions. In addition however to these, other weights 
as well as measures of capacity were made with great care by 
Mr. Bate. The following is a list of the whole, with an 
account of the places where they are deposited. 
Standards deposited at the Exchequer, Westminster. 
1 Imperial standard yard with gold points. 
l Standard yard with steel terminations, No. i. 
l Imperial troy pound, No. 5. 
1 Avoirdupois pound, No. 1. 
