Faraday to John Barrow   9 May 1837

Royal Institution | 9th May 1837

Sir

I have received your letter and the three small pieces of metal¹ but I think that the proposition to use such prepared metals extensively should be accompanied by pieces of the prepared plate as large as those it is proposed to use and also of a thickness equal to that which would be required in practice. There are several reasons why in the present case results with such small pieces as you have sent me might not correspond with results on larger & thicker pieces or with results on small pieces cut from larger & thicker pieces[.]

I will therefore wait your further instructions before I experiment on the present pieces[.]

I have the honor to be | Sir Your Obedient Servant | M. Faraday

Sir John Barrow Bart | &c &c &c

Endorsement: Acq Com Craufurd² & dir him to supply them JB May 11th