Faraday to James Timmins Chance   13 August 1860

[Royal Institution embossed letterhead] | 13 Aug 1860

My dear Sir

You offered at one time to give me a drawing of your curves &c but I had in the mean time sent it back¹. That makes me ask your help in this way[.] Can you give me a drawing full size on a long sheet of cartridge paper of the position of your pieces of glass? I want to consider for myself in conjunction with experiment on a good lamp where I think the focal points should be taken. I do not want the angles of each piece with great accuracy but their position in relation to the lamp, so as to give their distance from it, & the angles which the rays proceeding from it to them make with the horizontal ray - also the distance between the burner & focal plane.

Ever My dear Sir | Truly Yours | M Faraday

Jas. Chance Esq | &c &c &c