Bartholomew Lane E. C.
London
July 13 1883

J. E. Hilgard
Superintendent

Dear Sir,

Having received the enclosed letter from Mr. Chaney, I have replied that I have referred it to you with an expression of my concurrence in its suggestions. I would respectfully suggest that the comparisons I have made are not sufficient to give the yard with sufficient accuracy for the U. S. Standard.

I have made the comparisons of Nº 57 and 58. They are very concordant and make Nº 57 about almost exactly 4 divisions of the micrometer the shorter. This accords with the comparisons of 1853. But the bisection of me of the lines of Nº 57 is a matter of possible doubt, and in my opinion, the yard in the

Yours very respectfully,

C. S. Peirce
Asst.

P. S. I think it would be an excellent thing if General Cutts could make comparisons of Nº 57 with Nº 1 in the autumn.

Note

Bulks of thermometers kept as nearly as possible in the same plane in both positions.

Observations made with a lens only, at the temperature of the air of the Room, and of the water in the room.

Sketch of Calorimeter being an axis in which bulbs were enclosed.