Museum Prac^tl Geology
Jermyn S^t
S^t James’s
30^th January 1852

Dear Sir

I venture to intrude again upon your well occupied time – and explain our object. It is a complete illustration ^<1> of the results of Photography. For example a picture on paper prepared with Nitrate of Silver only ^<2> – with the Chloride &c leading to your Calotype ^<3> – and specimens of all the chemicals employed in the production – The same with the Daguerreotype ^<4> & Sir John Herschel’s processes ^<5> If therefore you could furnish the Museum with one good Negative Camera View – and a positive copy printed which we should only inscribe as presented by the inventor of the Calotype we should be greatly indebted to you.

I am Dear Sir Yours very truly
Robert Hunt

H Fox Talbot Esq^r

---

Notes:

1. See Doc. No: 06558.

2. Photogenic drawing, WHFT's first process, which was a print-out process used to make either negatives or prints.

3. WHFT's second process, which used a developer to bring out a latent image, much reducing exposure times. The negatives created this way were typically printed on photogenic drawing paper.

4. Sir John Frederick William Herschel (1792–1871), astronomer & scientist, invented a number of photographic processes, among them the cyanotype; he also made photographs on glass plates at an early stage.