Faraday to William Henry Fox Talbot   16 June 1851

R Institution | 16 June 1851.

My dear Sir

I do not know of Hares¹ Experiment²[.] We have no flat coil of copper: but perhaps an Electromagnetic coil would do. When you pursue your subject you can try such as we have and also the spiral tube. I should not expect much from either process: the latter you cannot put into the focus of a lens or mirror as you can the former i.e the single spark[.]

I do not know what mirror you used but I should have thought that a deep one would answer better than a shallow one. Such as they use at the lighthouses collects 2/3 or even 3/4 of the rays which issue from the light in the focus.

There is no occasion for any one to think much for you are well able to think your own thoughts to an end. For my part the moment I can get clear of the run of ordinary business all my thought will given to the Magnetism of Oxygen[.]

Ever Truly Yours | M. Faraday

H.F. Talbot Esq | &c &c &c