Peter Henry Berthon to Faraday   5 May 1858

Trinity House, London, E.C. | 5th. May, 1858.

Sir,

The Board’s attention having been directed to the alleged superiority of the Red Light recently exhibited by the French Authorities, in the Malakoff Light House at the Entrance of the River Garonne, over other Lights of that colour, - I am directed to request you will favor the Elder Brethren by stating whether any recent improvements have come under your observation whereby Lights of the colour alluded to, have been rendered more effective, and visible at a greater distance than they have hitherto been considered capable of being.-

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

M. Faraday Esq | &c &c &c | Royal Institution