Gosport 31 Decr 1847
My Dear Sir
I beg to return you my best thanks for your kind reply to my note of the 13th and your intimation that Mr Henneman by your desire would make no charge for instruction if the apparatus for sun pictures were provided at my own expence.
The Expedition is under the direction of the Admiralty and is formed solely for the purpose of communicating with the Discovery Ships commanded by Sir John Franklin, it is therefore only incidentally and during the winter that I shall have leisure to turn my attention to any scientific object. I have communicated with Mr Henneman and find that the expence including extra chemicals for travelling of an apparatus for making sun pictures will much exceed the sum I had put down, (from my ignorance of what was requisite,) in the estimate I was called upon to furnish before I could make enquiry as to the cost of all the articles. This I will endeavour to meet by dispensing with something less urgent, but I do not feel that I would be justified in making a charge to the Admiralty for personal instruction and I cannot therefore avail myself of your kind intentions, but if January closes without any tidings of Sir J. Franklin and it becomes thereby certain that I must go out I shall be glad to receive Mr Hennemanís instructions on the usual terms.
With many thanks I remain yours faithfully