Faraday to Peter Henry Berthon   11 May 1859

Royal Institution | 11 May 1859.

Sir

I have examined the Tunis apparatus - I find it quite satisfactory. The glass is good in colour and well wrought & fixed[.] The optical & frame work both satisfactory. The position of the lamp required a correction which is easily made & I ordered it to be done¹[.]

I am Sir | Your Very Obedient humble Servant | M. Faraday

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