Faraday to George Biddell Airy   20 May 1857

[Royal Institution embossed letterhead] | Albemarle St. W. | 20 May 1857

My dear Sir

I am very glad you have seen the Magneto electric light¹. Is it not a remarkable & wonderful source. If Professor Holmes agrees to what you propose I hope you will let me know[.] I should like to see the light from the Observatory though I have already seen it from Woolwich. I do not know what arrangements are possible for Professor Holmes[.] I think the means of variation at the Wharf are but few but I cannot doubt that he will do all he can & that you require.- I should like him (if they can arrange it) to shew you an Argand lamp in a Parabolic reflector both with the naked electric light & with the same light in a reflector; & I should hope also that they could make both the lights traverse that you might see the coming on & passing away of the beam[.]

Ever Very Truly Yours | M. Faraday

G.B. Airy Esqr | &c &c &c