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sii. The Optical Magic Lantern Journal and Photographic Enlarger.
9 Patent L for Optical S TO C KS . Magic Lantos a
109 sTANDARD CANDLE-POWER.
L
1
STANDARD CANDLE-POWER.
PRICE, 28/EACH, COPY OF CERTIFICATE OF TEST.
“This tg to certify that 1 have this day tested onc of Stocks’ Patent Oil Lamps for Optical Lantorns, and find that the light given by it is equal to LOG Standard Candle-power; also that the multiple flame is very compact, and when used in a Lantern, a very evenly-illuminated disc of great brilliancy and purity is produced, far exceeding that of the ordinary 4-wick lamps. J
“* October 10th, 1894. (Signed) W. J. COLES, A.M.I.C.B.”
These Patcnt Stocks’ Lamps, of 109 Candle-power, ean be purehased from all Dealers PRICE 28s. each.
Ghe “Sjector” Blow: Ghro’ Fet.
513 STANDARD CANDLE-POWER. Price 20s. each.
The following is an extract from a report by Mr. W. J. COLES, A.M.1.C.E.:—
“ This Jet was tested in order to ascertain—Firstly, its illuminating power, and secondly, the consumption of Oxygen. The results are as follows :—The maximum obtainable light was 513 candlc-power with 13 in. pressure of Oxygen and } in. pressure of Hydrogen. The Ejector arrangement of Jet causcs an increase of pressure of Hydrogen at Jet of over 100 per ccnt., that is, before turning on Oxygen the pressure of Hydrogen is equal to 3 of water, but when the Oxygen is flowing a partial vacuum is created, which causes a greater flow of Hydrogen, and more than doubles its pressure at the Jct. Soft Limes are practically useless for this Jet, as they burn away very rapidly. ‘ Hardazion’ are the best. The distance that the lime should be from Jct is about half-an-inch.”
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This Jet is QUITE AS POWERFUL as any | NOTE.—None are genuine “ Ejector ” Jets ordinary Mixed Jet, with the GREAT ADVAN| unless stamped on each Key with the following TAGE that only ONE CYLINDER OF GAS' Trade mark :—
(Oxygen) is required, the house gas being
taken from the main as with the ordinary Cu Blow-through Jets. ear icey