The Optical Magic Lantern Journal (December 1894)

224 The Optical Magic Lantern Journal and Photographic Enlarger. MASON’S JAANTERN MICROSCOPE. Mr. R. G. Mason, of 69, Park Road, Clapham, has made a number of minor improvements on his patent lantern microscope, and at the late Cornwall Exhibition it was awarded the silver medal. This microscope possesses the advantage that with it are supplied extra fittings, which quickly enable it to be used as a table microscope ; so that the one instrument answers the two purposes. -——:0:-— Editorial Table. ‘‘SILVEROID.'’—F rom the Silveroid Co., 90, Northcote Road, Walthamstow, we have reccived a bottle of solution named as above. By applying a few drops on brass, copper or worn electro-plate, and then polishing, a coating of pure silver is imparted to the article. The company guarantee the solution to be free from mercury. ANTWERP AND ITS ExHIpITION.—The reading of this popular set of sixty-six slides which is advertised on another page is written in a particularly interesting strain by Mr, Hdmund H. Wilkie, late of the Polytechnic. The interest is kept up to the very end, and, the happy knack that Mr. Wilkie possesses, each picture is led up to in such a manner that no signal is required between the lecturer and operator, for the latter on following the lecture knows the precise moment to change the slide without tae lecturer having to resort to signals. After seeing the pictures and hearing the Jecture one might well imagine that they had travelled for a week instead of comfortably sitting on a chair for a couple of hours. Carson Paintin. By E. J, Wavy. (Lonpon : Hazen, Watson & VinEy), 1/-. Nearly one half of this book of sixty-eight pages is taken up with an interesting history of the permanent process of priuting in carbon. Commencing with the year 1798, when chromium was discovered, Mr. Wall traces and gives the exp2riences of investigators bit by bit until he brings it down to the present day. Particulars are given respecting the preparation of the non-sensitive tissue ia a variety of colours, then as to the mode of sensitising the same. Afser chapters on Drying, Keeping, and Printing, the mode of development is treated upon, which in turn is followed by methods of transfer. The making of lantern slides by this process is fully dwelt upon, after which comes a@ very important chapter on Failures, by reference to which the student is enabled to ascertain what he has done or left undone should his results not be satisfactory. The book is written concisely, and is full of informat'‘on. THomas’s LanTERN PravTes.— According to the samples of these plates which we have received, it is quite evident that they hold their own as to quality and ease of working. Messrs. Thomas have come to the conclusion that the best results are obtained with an exposure by magnesium wire when making contact slides. In the instructions issued full details are given respecting the requisite exposures (for reductions) for producing any desired tone, using in each case @ particular developer of which each box of plates contains full particulars. Proportions are given for both pyro and hydroquinone developers, so that either black, brown, purple, or red tones may be obtained on these plates. VEveR's PaoToGRAPHIC Primers.—Mr. C. C. Vevers, of Leeds, has lately published four useful primers, these being for the most part papers which he has delivered at photographic societies at Leeds. No. 1 treats on Beginner's Errors; No. 2, Optics; No. 3, Printing Dodges; and No. 4, Enlarging. The particulars given are very useful, especially as the author enters into minute details on some points that will materially assist even the somewhat experienced hand, whilst the tyro will consider that those primers at twopence fill the proverbial “ want.” :0:-— Patent Intelligence. The following list, relating to current Patent Applications, ts compiled expressly for ‘‘The Optical Magic Lanterr Journal” by a registered Patent Agent. Wor further information apply to S. Dicker, clo ''‘ The Optical Magic Lantern Journal,”’ 56, Chancery Lane, London, W.C. No. Recent Patent APPLICATIONS. 18503. 29th September, 1894. Frederick Bartlett. 1mprovements in optical lantern slide carriers, and the hanging of slides therein. 19611. 16th October, 1894. W. H. Jones. Improvements in dissolvers for optical lanterns. 20095, 20th October, 1894. W.H. Tomlinson. Improvements in or relating to magic lanterns. 20181. 23rd October. George Davenport. Improvements ia slide carriers, and apparatus for optical or magic lanterns. 21164. Sth November. John Francis Hall Edwards. Improvements in lantern slide binding clamps. 21240. 5th November. Charles Goodwin Norton. An improved form of cut off for dissolvers for use with optical lanterns, specially relating to bi-unial and triple lanterns. CoMPLETE SPECIFICATIONS PRINTED. Copies of the following specifications may be obtained by remitting 1]for each specification to S. Dicker, ‘* Optical Magic Lantern Journal," 56, Chancery Lane, London, W.C. 18115 of 1893. Borland. Electric arc lamp for projection purposes. 21880 of 1893. Clifton. Producing enlarged copies of photographs. 23616 of 1893. Lea. Protecting gas cylinders. 24038 of 1893. Cresswell. Stage, etc., lighting. 24135 of 1893. Simpson. Magic lanterns. 24761 of 1893. Manchester Oxygen Company, Limited, and W. M. Jackson. Utilising the pressure in cylinders or reservoirs containing compressed gases. 1091 of 1894. Klodt. Optical lantern. 12230 of 1894. Wrench. Magic lanterns. 15819 of 1894. Davenport. Curtain slide optical lanterns. 16326 of 1894. J. Train. Displaying panoramic scenes by means of the lantern. carrier for