Peter Henry Berthon to Faraday   11 May 1864

Trinity House, London. E.C. | 11th May. 1864.

Sir,

The First order Dioptric Apparatus for a fixed Light supplied by Messrs. Sautter & Co. being ready for examination, I shall be glad to be informed if you would wish the same to be fitted for your inspection at this House or at Messrs. Wilkins’ premises in Long Acre.

I am, | Sir, | Your most obedient Servant, | P.H. Berthon

Professor Faraday | &c &c &c | Royal Institution.