Faraday to Peter Henry Berthon   11 May 1858

Royal Institution. 11 May 1858.

My dear Sir - No improvements or propositions for improvements of the red lights have recently come under my observation¹.- I am not likely to receive such subjects except through you - On the 11 July 1857, I reported on a proposition by Captn. Denham² to employ red glass chimneys instead of the usual plates of red glass³ - On the 17 March 1843 I reported on some proposed combinations of red & yellow glass and also respecting the Ruby glass⁴ - On the 26 Decr. 1845, I reported on a proposition to line the silver reflectors with red glass⁵. - On another occasion of which I cannot recall the date I reported to the Trinity board on a proposition to use red serge in place of red glass - In none of these cases was the light improved - The use of the ruby glass being excepted - by the plans & suggestions brought forward[.]

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

P.H. Berthon Esqr | &c &c &c