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57 THE OPTICAL magic LANTERN JOURNAL
Our Book Shelf.
We have received a copy of the 2nd volume of “ Traité Genéral Des Projections,” by. Eugéne Teutat, Docteur és Sciences, Chevalier de la Legion d’honneur, etc. The volume treats principally of Scientific Microscopic Projection apparatus, Animated Projection. Various illuminants and experiments. We would like to see an English translation, as such it would be a book very much sought after.
The price is not mentioned, but volume I was 7 fr. 50. So we presume vol. 2 is the same price.
Mr. Wm. Tylar, of Aston, sends a detailed catalogue of Lantern apparatus fully up-to-date, giving full details and prices to suit all pockets.
We also note another issue of the well-known book, ‘‘ Photography in a Nutshell” which has now reached its 83rd.
BRR HH
Correspondence.
DEAR Sir, .
“We have noticed the correspondence and articles with reference to the recent accident, where Mr. Oswald Thackeray met his deatly through experimenting with acetylene. We wrote to the Daily Gazette an article which was published in their issue of December 22nd, 1902, pointing ont that acetylene gas is produced in generators by two methods, viz., (a) By applying water to carbide. (6) By dropping carbide into an excess of water.
In the first the point to observe in the purchase of a generator is, whether the gas holder, which regulates the cut-off of the water, could by any means be held down so that the water would continue to run on to the carbide, or wonld any other defect or accident to the tap or valve, regulating the snpply of water be likely to bring about the same results, if so, then an excess of gas would be generated, and should a light benear at the time—danger.
In the second method, which is the one most highly recommended by all the highest authorities (because the gas is cleansed and cooled as it rises through the water), in this type, when valves are nsed to regulate the flow of carbide to the water; in the generating chamber, by the rise and fall of the gas holder, care should be taken to notice whether or not’an accidental holding down of the gas holder or sticking of the valve would not allow the carbide to keep running into the water, with exactly the same result.
These remarks, of course, apply only to the automatic types of generators, which, owing to the small space tliey take up, and cheapness, will no doubt fiud most favour with the public. So far as I can see there is only one of the latter type made in which it is impossible to get an overcharge of gas, as the carbide is dropped into the water in specific charges, in such a way that it is impossible’ to get more than one charge deposited until the gas from the preceeding charge has been exhausted. I refer -to one made for lantern use, sold by a London firm, hut the principle can no doubt be applied to large generators also. I think that this
should be made known to the public as widely as possible, as if they insist upon getting safe generators, the manufacturers will have to supply them. GREEN & Co., Lime-light Operators. 57, High Street, Aston, Birmingham. DEAR Srp,
‘Reading in your Journal of the death of Herbert Oswald Thackray, of which [ am very sorry to hear, [ beg to say that I constructed an apparatus of the same kind, the design of which you will find in the Alodeland Electrical Engineer, and have used it ever since to try cinematograph films at my place of business, and must say that it acts splendidly showing 2 ft. pictures. The
* design is something of this kind, an inner cylinder
holding carbide, with four holes punched about. halfway up, and covered with lint so that the water shall just dribble on to the carbide, a bell which must be locked in position, and an outer cylinder to hold the water, and 1 find it perfectly automatic. Any time you are my way I shall be pleased to show it to you. IT remain, yours faithfully,
J. H. BLIssert.
14, Tividale Road, Tipton, Staffordshire, January 14th, 1903.
ee Se Answers to Correspondence.
W.J.5.—We duly received the Regulators, and must say they are in a bad condition, the rubber has perished as we suggested. At your request we sent them to the makers, and although we have since written two letters and two postcards, we can get no reply, so must presume they are useless. :
Beards most decidedly.
Yes. We have an article on the life, ctc., of various regulators, which we hope to publish shortly.
CONDENSOR. —A is the correct form. the picture.
B would distort
ACETYLENK.—1]. No! 2. We would not care to experiment with such an apparatus. 3. Beards. 4. Gwyers. 5. Tylars. 6. Yes, we are fully aware that the slides are not what they should be, but people here have got the impression that snow is on the ground
. at Xmas and so the shepherds must be lying on snow
round a fire. 7. Write the makers and complain. 8. See advertising columns. 9. Warwick Trading Co., Warwick Court, High Holborn, London, W.C.
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Patent Intelligence.
Compiled expressly for this Journal by Messrs. W. P. Thompson & Co., Chartered Patent Agents, 322, High Holborn, London, W.C., and at Liverpool, to whom all enquiries should be addressed.
Magic Lantern Applications. RECENT PATENT INTELLIGENCE.
Improvements relating to devices for synclironously ‘operating phonographs and cimematographs. H. H. Lake (La Société L. Gaumont et Compagnie). 15th January, 1903.
No. 1093.