Faraday to Peter Henry Berthon   15 November 1856

Royal Institution | 15 Novr. 1856

My dear Sir

I have applied to Mr. Wilkins for any drawings or plans of the apparatus referred to¹ but can get no information that will enable me to form an opinion without the aid of a personal inspection. I venture to suggest that Mr. Wilkins be instructed to arrange three of the sections each about 10 inches wide with the upper & lower reflectors on the frame at the Trinity house along side & next to a lenticular pannel already on the frame. The Deputy Master² & Brethren can then see the effect & I think the distance will be quite sufficient for my observation i.e if the optical work prove to be of the usual character of that produced in France[.]

I am My dear Sir | Very faithfully Yours | M. Faraday

P.H. Berthon Esq | &c - .