Excerpt: ...the camera. Daguerreotypists generally mark time by their watches, arriving at the nearest possible period for producing a good picture by making several trials. As a ready method of marking short intervals of time is, however, a very important consideration, and as any instrument which will enable an artist to arrive at the exact ...Read MoreExcerpt: ...the camera. Daguerreotypists generally mark time by their watches, arriving at the nearest possible period for producing a good picture by making several trials. As a ready method of marking short intervals of time is, however, a very important consideration, and as any instrument which will enable an artist to arrive at the exact period, must be an improvement, and worthy of universal adoption, I will here describe one invented by Mr. Constable of England, which he calls a Sand Clock, or Time Keeper.--"It consists of a glass tube, about twelve inches long, by one in diameter, half filled with fine sand, similar to that used for the ordinary minute glasses, and, like them, it has a diaphram, with a small hole in the centre through which the sand runs. The tube is attached to a board which revolves on a centre pin; on the side is a graduated scale, divided into half seconds; the tube is also provided with a moveable index. This instrument is attached, in a conspicuous place, to the wall. The glass tube being revolved on its centre, the index is set to the number of half seconds required, and the sand running down, the required time is marked without the possibility of error. In practice it will be found to be a far more convenient instrument for the purpose than either a clock or a seconds watch, and is applicable both for the camera and mercury box." If the artist finds it desirable or necessary to take the object to be copied in its right position, that is reverse the image on the spectrum, he can do so by attaching a mirror (which may be had of Mr. Anthony, or Mr. Roach) to the camera tube, at an angle of forty-five degrees. If, after taking the plate from the camera, it be examined, no picture will yet be visible, but this is brought about by the FOURTH PROCESS.--Bringing out the Picture, or rendering it Visible.--We now come to the use of the mercury bath, Fig. 11. To the bath a thermometer is attached, to indicate the proper degree of beat...Read Less
Near Fine in Very Good dust jacket. Small 8vo 139 pp; Light shelf wear on corners and spine ends, otherwise clean and tight. DJ is foxed on the front panel and has a bit of edge wear on top of spine. A nice copy. Dust jacket protected in clear Brodart cover.
Very Good in Very Good dust jacket. 0871000148. VG book in like DJ in mylar, tight free of internal marks Mild edgewear, sm wear to spine edges, Dj has some age dicoloring, sticker from photography shop, some closed nicks; This the first bound treatise on photography ever published in America originally printed in 1849; 12mo; 139 pages.
Facsimile edition. Small hardcover. Introduction by Beaumont Newhall. Originally printed in 1849. A very near fine copy in a close to near fine dust jacket with a small closed gouge to the gutter of the front panel. Otherwise, a clean copy.
Copyright in bibliographic data and cover images is held by Nielsen Book Services Limited, Baker & Taylor, Inc., or by their respective licensors, or by the publishers, or by their respective licensors. For personal use only. All rights reserved. All rights in images of books or other publications are reserved by the original copyright holders.