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xiv. The Optical Magic Lantern Journal and Photographic Enlarger.
oT 9 Patent Lamp for Optical S T O C KS . “Magic Lanterns a
109 srANDARD CAND LE-POWE R.
STANDARD CANDLE-POWER.
ons
PRICE, 28/EACH, COPY OF CERTIFICATE OF TEST.
“This ts to certify that 1 have this day tested one of Stocks’ Patent Oil Lamps for Optical Lanterns, and find that the light given by it is equal to LOS 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.
** October 10th, 1894. (Signed) W. J. COLES, A.M.1.C.E.”
These Patent Stocks’ Lamps, of LO® Candle-power, can be purchased f. PRICE 28s. each. P rom all Dealers
Ghe “Sector” 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 candle-power with 13 in. pressure of Oxygen and 3? in. pressure of Hydrogen. The Ejector arrangement of Jet causes an increase of pressure of Hydrogen at Jet of over 100 per cent., 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 Jet. 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 Jet is about half-an-inch.”’
This Jet is QUITE AS POWERFUL as an NOTE.—None are genuine ‘ Ejeetor "' 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 Blow-through Jets.