Peter Henry Berthon to Faraday   18 June 1858

Trinity House | 18 June 1858

My dear Sir,

A Committee of the Elder Brethren who have recently visited the Bishop Rock Light House have been much disappointed at the very queer appearance of the Glass of the Lantern put in by Mr Wilkins, a specimen of which I send herewith, - it was order[e]d of an unusual thickness 7/8ths of an Inch, on account of the exposed position of the Tower, but the Board were assured that this circumstance would not interfere with its purity or Colour, this being the Case, the Deputy Master¹ who is much annoyed about it, has desired me to send the Specimen to you with a request that you will favor him by saying whether the glass is as free from colour as is usual or practicable, & whether you consider that its use will in any degree impair the brilliancy or power of the Light when seen through it, or the distance at which it will be visible.

Believe me to be | My dear Sir | Yours very truly | P.H. Berthon

M. Faraday Esq | &c &c &c