R Institution
16 June 1851
1
My dear Sir?
I do not know of Hares Experiment <2>. We Have flat coil of copper: but perhaps an Electromagnetic coil would do/ When you pursue your subject you can try such as wer 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 a 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 lighthouses collects 2/3 or even 2/4 of the rays which issue from the light in the focus.
There is no occasion for any one to think much for you for you are well able to think your own thoughts to an end. For mt part the moment I can get clear of the run of ordinary business all my thoughts will be given to the Magnetism of Oxygen.
Ever Truly Yours
M Faraday.
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