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The Optical Magic Lantern Journal and Photographic Enlarger. 39
ELECTRIC SIGNAL.
for the audience to follow the signal that the lecturer uses when communicating with the operator, such as a bell at the reading desk or the too common “next ih slide please.”” It is a simple matter for all communications to be made quietly by electricity. To this end, Messrs. Butcher & Sons, of Blackheath, have brought out a lanternist’s signal, it consists of battery, coil, and push pin. A code of signals is also provided. COMBINATION CYLINDER KEY. The same firm have also introduced a cylinder key which is provided with means for tightening wing nuts as shown in the illustration, the same
ry
instrument also acts as gland spanner and cylinder key.
CYLINDER PROTECTORS, &c. Centreing carrier, tinters, and binders are also among the new things brought out by Messrs. Butcher. “The protectors are thick rubber rings which are placed on the cylinders to prevent
concussion, after the style suggested by Mr. H. P. Chandler, on page 19 of last issue. The tinters are made to fit the hood of lens and produce a very pleasing effect with plain slides.
the
old form used by this firm inasmuch as name of slide can be written on the edge as
well as on the side of the slide. The carrier
gx, Nothing is more = annoyingthan |
is well and accurately made, and is easily adjustable, so as to make the registration of unframed slides exact.
PETROLEUM LAMP STOVE.
During the late spell of cold weather is has not been uncommon for a magic lantern lamp to be used for heating a darkroom or other place where it is out of the question to have a fire, but as some lamps in the market give off an unpleasant and oily smell, and as all have a tall chimney which would cause them to be easily upset, a new form of lamp called the “ primus” will be appreciated. This lamp burns oil gas, gives little light, no smell and great heat. Ordinary kerosene or petroleum is poured into the reservoir at the screw cap shown in sketch, and one charge will burn for about three hours. To light the lamp about a teaspoonful of
methylated spirit is poured into the cup, midway between the reservoir and the burner and lighted. The flame from this heats the burner. Just before this spirit is burned out, air should be pumped on the top of the oil by two or three applications of the pump shown at side of reservoir. This causes the oil to be forced up to the hot tubes of the burner, when it is at once converted into gas which burns with an exceedingly hot flame. It will also be found useful and economical for a hundred-and-one domestic purposes. We tried it with a quart of cold water (84°) and found that it was brought to boiling point in exactly five minutes. These lamps which are of Swedish origin have lately been placed upon the English market and are being supplied to shops as quickly as possible by the wholesale agents, Messrs. Moeller & Condrup, of 78, Fore-street, E.C. They retail at 17s. 6d.