The Optical Magic Lantern Journal (November 1899)

’ 156 19843. 8rd October, 1899. Louis Antoine Garchey. Improvements in colour photography. 20300. 10th October, 1899. Abiathar Smitheman. Cinematphone or animated nature. 20621. 14th October, 1899. William Charles Louis Holland. | An improved method of pro| jecting the titles or descriptions of films | used in cinematographs or other animated photograph machines. SPECIFICATIONS ACCEPTED. Copies of the following specifications may be obtained by remitting I/— for each specification to W. P. Thompson — & Co., Patent Agents, 322, High Holborn, London, W.C. 18465 of 1898. Corthesy and Koopman. Means for obtaining rapid changes of wording or wordings or pictures, viz.,in changing the presentation of one board or sheet for another, and applicable to advertising purposes and also generally. 20603 of 1898. Thompson (Bagrachow). Kinetoscopic and cinematograph apparatus applicable also to photographic apparatus. 22976 of 1898. Reulos. Kinematographs. 23099 of 1898. Holmes. Cinematograph. 15372 of 1899. pictures or advertisements. —————_—i0-——— SS eo SSS Sao s PRESSURE GAUGES SHOULD BE TESTED OCCASIONALLY. To Mr. J. Hay Taylor, Editor. Dear Sir,—I believe that on one or two occasions you have inserted a note in the Oprican Macic LanrErn : JOUBNAL, reminding users of gas cylinders that gauges | employed for measuring the pressure in oxygen cylinders ; ought to be overhauled occasionally, and especially at the commencement of a new season, to ensure that the checks with which most of them are now fitted are | in effective condition. Nearly all accidents with these gauges have been caused by sudden admission of highpressure oxygen into the gauge tube. The gauges are fitted with checks to prevent this sudden admission of pressure. If the check is doing its work, the indicator of the gauge will only move slowly round the dial when full pressure is turned on from the cylinder. If the check has become loose, as it may do in time, it will allow the indicator to fly quickly round the dial when pressure is too quickly admitted ; and this should be remedied at once. Perhaps you may think it worth while to repeat the reminder in your next issue. Faithfully yours, W. MORTON JACKSON, For Manchester Oxygen (Brin's Patent) Company, Limited, Great Marlborough Street, Secretary and Manager. Manchester. The Optical Magic Lantern Journal and Photographic Enlarger. FEISE SESE NE SEDEME INE TE ETE HEE x OF Beles and Queries. EEC SESESE IESE SESE NE TE TEESE] J. Platt.—Your communication was duly sent to Mr. Theodore Brown. The book you enquire about will nos be published in future. Lanternist.—With two generators spoken of (but why not use one generator for the two burners), and two burners you should get @ well lighted. disc of about 6 feet in diameter. The burners are placed one behind the other. W7.1.—The early make of the ether saturator you speak of did not hold sufficient ether for one and a half hours. Probably the alteration by the makers was only to endeavour to prevent the ether from blowing out of the jet. The addition to the saturator, or rather tke auxiliary saturator which you intend adding, should answer well, but we should prefer that the extra tube lay in a horizontal position in preference to hanging ver . tically. Be particular not to make the stuffing too tight. Barth. Apparatus for displaying moving Photophilus.—(1) Thanks for article ‘Ripple on Waves'’; we will endeavour to insert itin nexs issue. (2) In order to project a parallel beam about an inch in diameter with your present apparatus, remove the objective altogether and place the illuminant exactly at ‘ the solar focus of the condenser, this will give you parallel rays. A little adjustment of the light will soon demonstrate the correct position. Now place in front (i.e., outside) of the condenser a mask in which has been cut a hole of an inch diameter, when you will get parallel rays of this diameter. If you take any ’ magnifying or burning glass and focus the sun’s rays | with it, the burning point is the solar focus and the rays coming to the lens are parallel. Now if a light is placed at the point alluded to, the rays after passing through the lens will, of course, be parallel. and the diameter of these rays will be according to the diameter of the lens. 1. W.—The sale of high-class triple lanterns has greatly fallen off the last few years. Cinematographist.—The blemishes or spots on the film when projecting are seen long after the picture on which they happen to be on has passed the condenser; this is owing to what is termed persistence of vision. If the film did not make a dead stop at all, then such would not be noticeable. AM. Benham.—We note your remarks on the slides which you purchased. The binding and general get up of the two you enclosed are simply a disgrace. If you deal with the same party in future, better insist on having them sent on approval. Anzious—Not if we can help it. Investment.—Better write to a financial paper, or get the advice of a reliable stockbroker. We cannot advise either way 7e taking up shares in a photographic compeny. A. Mann.—(1) To get rid of the blackening of the lime, you must get the gas compressors to ‘‘burn out’ your cylinder. (2) Willway’s saturator. No danger whatever. Retired Manufacturer.—Letter came about the time of going to press. Address .JWanted.—Will ‘‘ Exhibitor,” who has a ‘‘General Wants’’ advertisement in this issue, please forward his address, as it has been mislaid.