Faraday to Peter Henry Berthon   8 December 1859

Brighton | 8 Decr. 1859.

Sir

I have received from you Mr. Chances letter of the 5th Decr. 1859 and the drawings referred to in it¹. I agree with the principles stated in the letter I had occasion not long since to consider the chief matter; for which purpose I wrote to Messrs Chance and received from them a drawing & explanation which I sent to you². You will perceive that the object he has in view in increasing the number of the pieces of glass is precisely that proposed to be obtained in the pressed glass of M Degrand by increasing the number of stops i.e. diminishing the thickness of the glass traversed by the light & so diminishing the loss by absorption. I return the drawings & letter as desired³.

I have the honour to be | Sir | Your Very Obedient humble Servant | M. Faraday

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