TALBOT1573

31 Sackville Street ¹
July 18. 1827

Dear Sir,

I shall be most happy to receive your article on Light, ² and request you to send it here, as I no longer reside in the Albany. ³ But if after the 1^st of August pray send it to my house in the country Lacock Abbey, near Chippenham, Wilts. I have thoughts of briefly drawing up the demonstration of that property of an equidistant grating, of giving perfect spectra, which I mentioned to you. But I find it is necessary to begin with defining the manner in which the undulations may be supposed to be propagated as there are many conceivable ways – and it will thus form a short article complete in itself, which I may send to some of the scientific journals. I am sure that the Munich opticians would furnish object glasses simply mounted in their cells. I ordered one formerly but afterwards changed my mind.

I have a 4½ inch achromatic by Tulley ⁴ which I am going to try this summer, but I believe it is not good for much. Amici ⁵ has wonderfully improved my microscope of Chevalier ⁶ by adding a lens to the object glass. He is now gone back to Paris. The optical apparatus is not yet come from Hamburgh. M^r Hussey’s ⁷ memorandum does not agree with M^r Utzschneider’s ⁸ invoice of the goods. Instead of 30 small lenses only 12 are sent. Can you inform me if Cap^t Ross ⁹ is going to sell his large telescope by Ramage, ¹⁰ and what he asks for it. I have no idea of the cost of a 20 feet Reflector, can you inform me?

Believe me dear Sir Yours most truly
Henry F. Talbot