Mr. Sisson's Developing Solution.—The Rev. Mr. Sisson, in a letter I received from him a few days ago, stated that he had been trying, at the recommendation of a gentleman who had written to him upon the subject, a stronger developing solution than that the formula for which he published some time back in your pages, and that it gave splendid positive pictures with very short exposure in the camera.
Since I received his letter I have been able to corroborate his testimony in favour of the stronger solution, and have much pleasure in sending you the formula for the benefit of your readers. It is this: 1½ drachms of protosulphate of iron in five ounces of water, 1 drachm of nitrate of lead, letting it settle for some hours; pour off the clear liquid, and then add to it 2 drachms of acetic acid.
J. Leachman.
20. Compton Terrace, Islington.
Mr. Stewart's Pantograph.—Will some of your photographic readers, who may know the proper size of Mr. Stewart's pantograph, give a detailed description of it? We should have focal length of lens, size of box, and the length of the sliding, parts of it. Cannot the lens be made fast in the middle of the box, provided the frames can be adjusted for different-sized pictures?
R. Elliott.
Replies to Minor Queries.
George Browne of Shefford (Vol. viii., p. 243.).—I observe that in your interesting publication you have inserted the Query which I sent you long since. A somewhat similar Query of mine has already appeared, and been answered by your correspondents H. C. C. and T. Hughes; the latter stating that my particulars are not strictly correct, inasmuch as the individual styled by me as "Sir George Browne, Bart.," was in reality simple "George Browne, Esq." I admit this error; but if I was wrong, Mr. Hughes was so too, for George Browne's wife was Eleanor, and not Elizabeth, Blount, as appears by his affidavit in the State Paper Office, wherein he deposes that he "had by Ellinor, his late wife, deceased daughter of Sir Richard Blount, eight sons, namely, George, Richard, Anthony, John, William, Henry, Francis, and Robert, and seven daughters."
The sons are thus disposed of: