The Optical Magic Lantern Journal (April 1894)

THE OPTICAL MAGIC LANTERN ——o < JOURNAL AND PHOTOGRAPHIC ENLARGER. EDITED BY J. HAY TAYLOR. APRIL 1, 1894. Price One Penny. Entered at Vol. 5.—-No. 59. [s.reres Han PAGE Notes... . Wee fee: KA. ea ac Sem yaw, See at 28s, ie G8 Registering Lanterns oe best) der Ube “die, Wane aleser Sete ater HOE Experiments 1n Optica) Projection ioc Se dae teas eae He, es Ga'6B Old Poly echnic Slides .. stay sasae Ager. xs? 169) Hand Oameras for obtaining Slides for the Lantern $e. 3) bar way 70 My First Lantern Show.. .. 7 ee ee en P| Condensers—Double and Triple... ea ad) ain ade cea. 04 Is the Popularity of Lantern Lectures s Declining « wis: Te, aye, cee MD Humorous Lantern Slides .. .. SOs a ts. Seo Gate The Lanternin Oburch.. 2.0 -. 06. ee ee ee ee ee ee ee 7 New Apparatus, &c. 6. 6. ee ee ee ee ee ee ee ee ee 79 Editorial Table «s60 5.0 a6 se 6s oe Ba ee ee we oe oe BD Patent Intelligence... -6. ee we ee ee ee ee ee ee BD Qorrespondence .. 2. we ee ee ne ee ee ee ee eee 82 Notesand Queries... 6. ee we ee ee ee ee ee ee we BA Notices. Tue Optical Magic Lantern Journal and Photographic Enlarger is issued on the 1st of every month, price One Penny, and may be obtained from all Newsvendors, Railway News Stalls, Photographic Dealers, or from the Publishers, at the following rates, post free :— United States. 12 months . ee «Q/a. we) 60 cents. Single copies .. [2° es were Bo 55 Advertisements (Scale ‘of Charges), displayed :— £ s.d. Front and back pages, by arrangement. Ordinary page (whole).. ae 3 0 4 » (half) .. = 115 0 4 »» (quarter) as 10 0 » (eighth) ee 10 0 Pr 5» per 1 inch in colamn.. 6 0 » ” ” 4 ” ” 3 0 Excuance Column, General Wants, &c. (not Trade) — First 20 words, 6d.; and for every 3 additional words, 1d. ADVERTISEMENTS must reach the office not later than the 24th of each month. All cheques and postal orders to be made payable to Taylor Brothers. EDITORIAL communications must be addressed, J. Bay Tayuor. Advertisements and business communications to Taylor Brothers, 56, Chancery Lane, London, W.C. American Agents:—The International News Co., 83 and 85, Duane Street, New York City. NOTICE. Each. Postage. Binding Cases for 12 numbers .. .. .. lj.. lid. Reading Cases with 12 cords at back 3 .. lad. A limited number of bound vols.tor1893 3/6 .. 4id Notes. THosE who are concerned in figures may find the following of interest :—The approxiinate weight of a molecule of hydrogen is given by an eminent authority as 0:000,000,000,000,000,000,000,04 of a gramme; multiplying this inconceivably small number by 53, the atomic weight of iron, the weight of a molecule of iron is ascertained—0-000,000,000,000,000,000,002,2 gramme. In the sulphocyanide test the presence of thirtythree ten-millionths of a gramme of iron is detected; dividing this number by the weight of one molecule of iron, it seems that this apparently delicate test ig unable to indicate to our senses a less nurnber than 1,500,000,000,000,000 molecules. Tue Trinity Hodes aiiiiotities have lately perfected a system fox .recording the comparative illuminating intensities of the electric light with oil and gas, avd a report will shortly be issued by the Trinity House Committee. ie x” a A SHORT time azo, whilst some 400 scholars of a school at Godalming were being arranged in a& group upor ajwooden staging 20 ft. high in order to be photographed, part of the structure collapsed and between twenty and thirty boys fell to the ground. Three or four cases of dislocated limbs occurred and a panic ensued. The sufferers are progressiug favourably. at a * WE enjoyed a very pleasant evening on the 16th ult. at the Bloomsbury Hall on the occasion of an entertainment held by the employees of the Eastman Photographic Company. The first part consisted of songs, recitations, &c., and the