Peter Henry Berthon to Faraday   28 March 1862

Trinity House, London, | E.C., | 28th March, 1862.

Sir,

I am directed to inform you that the Elder Brethren propose to exhibit a Light, from the Light House now in course of erection at the South West End of the Island of Guernsey, which shall shew a red Flash of 5 seconds duration, and that they will be glad to receive any advice you can offer to them in respect of the most efficient method of obtaining a powerful red Flash¹.

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

M. Faraday Esq: | &c &c &c