The Optical Magic Lantern Journal (December 1902)

AND PHOTOGRAPHIC ENLARGER. 32 brought in a new jet for this season which they call the No. 5, and the experiments tried with this jet far out-eclipse anything we ever saw or did with jets at double the price. After several intensity tests the lime was taken off the pin and the flame allowed full scope and power, this extended from 12 to 14 inches, so that lanternists must keep a careful eye that limes do not split and fall off unless they are using a good size lantern. To shew penetrating power of this jet a piece of cast steel was fused in about 20 seconds, and while we are writing a piece of wrought bar steel is before us, of about 14 guage, there are two holes bored therein and very neatly done too by tbe No. 2a jet, and while watching these experiments, we were struck by the thought that not one in twenty of us knew what we could do with our jets, the powerful flame from this jet formed it into the most powerful blowpipe, any need desire for Laboratory, or Iixperimental purposes. With one of these and a crucible, almost any kind of metal could be fused and brought to white heat in a very short time, and as we suggested to Mr. Gwyer, if a blowpipe on principle of these jets was put out, no Laboratory or workshop would be complete without one. A new Blow-through jet has been submitted to us, and after fully testing it, we come to the conclusion, that it is a decided improvement on the old style, it is fitted with two fine adjustment taps, and has exactly the same principle of lime turning arrrangement and pin clamp as the 35/mixed jet. The coal gas, either from cylinder or main supply is carried up toa brass burner of good capacity and construction, the Oxygen supply comes up through a very fine wire-like tube through the centre of the flame in the burner, causing a very even mixture of gasses. In our ‘Biunial we placed this new jet and one of the old type, the comparison being decidedly in favour of the new. We understand the retail price will be 15/-, and at this price there should be a good sale. Explosion with Aceteleyne Generator.— On the eve of going to press we receive information that a young friend of ours has met with a very serious accident whilst experimenting with this gas, and a home-made generator, one side of the face is blown away, and it is feared loss of the sight of one eye will result. He lies in a very precarious condition, and our sympathies go out to his parents Mr. and Mrs. W. W. Thackeray; Broad Street, Birmingham, Thro’ our Lantern. x fi have pleasure this month in calling ) /\ és attention to two special lines of Messrs. Perken, Son and Co., Ltd., of Hatton Garden, London, E.C., both of which we can stronglyrecommend to intending purchasers. The first is the :— ‘ = Mil AS “Optimus” Improved Educational Lantern. This lantern is made of substantial Russian Tron, therefore very durable and unlikely to rust, it possesses the great advantage over the ordinary model “Optimus” Educational Lantern, of an outer covering of stout perforated Russian Iron, thus permitting a current of air to pass over the heated inner lining. The stage plates and sliding tube are of well finished Brass. The lens is a first-class Petzval Portrait Combination giving really excellent definition—the wick is a 3-wick Refulgent complete in outside box for carrying, and retails at £4 5s. The other is a very excellent article styled the :— Superior Optical Lantern, for Drawing’ Room or Lecture Hall. This form of Instrument is specially suited for exhibitions Hach !Lantern is fitted with {Safety Blow-through Jet for Oxy-Hydrogen Light or