James Timmins Chance to Faraday   27 August 1860

Hamstead | Birmingham | Augt. 27, 1860

My dear Sir,

Many thanks for yr note¹.

Your & my sections of the flame for the lower reflectors are wonderfully near; because please to observe that mine (18mm above the burner for the common intersection) is for the lower inner angles, & yours (21mm) is for the middle of the inner faces; this wd make between one & two mm difference. And, also, I was in great doubt between 18mm & 20mm for my point in the outer flame.

We really, therefore, coincide. This relieves my mind greatly, because I was anxious to have your own independent results.

I like very much your suggestions for the upper reflectors: I will try your foci soon.

I shall of course repeat experiments for the lower reflectors so as to be quite sure.

I truly hope that the Trinity Board will not be in a hurry in deciding about the lamp for the “Smalls”: that is - not without your concurrence & advice. The means of accurate & firm adjustment both centrically & horizontally, as well as in regard to the vertical height of the burner, is (as you know) a matter of very great importance.

At Whitby there was no provision for adjustment. At North Foreland, a very unsatisfactory provision.

Most truly yours | James T. Chance

Profr. Faraday