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lighting trades limited
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Lighting Trades Limited
77-79 Farringdon Road
London
England
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Lighting Trades Limited and the Welsbach Light Company Limited
51/55 Garratt Lane
London SW18
England
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The firm took over the Welsbach Lighting Company in 1929.
The firm are exhibiting lanterns fitted with their Welflex artificial silk street lighting mantles. "These mantles are manufactured from
the finest artifical silk and the high candle power obtained from them is maintained constantly throughout their life. It is possible with these mantles
burning from dusk to dawn all through the year to obtain an average as low as 2.5 mantles per nozzle per annum." - APLE Conference Programe 1937
They were showing their ranges of gas mantles, including the Welsbach,
Zeimar, Ironclad and Plaisetty for both low
and high pressure gas lighting. Their works has the highest annual output in the world
of gas mantles. (They also exhibited special mantles developed for war use which "dimmed"
the output of lighthouses.) A RENOWN Copper Suspension Lamp and
RENOWN Square Street Lantern along with Street Lighting Conversion Sets
were being exhibited. - APLE Conference Programe 1945
All types of Gas Mantle, from the minute example required for the illumination of a microscope to
the robust and extended efforts demanded for lighthouse work and high pressure street lighting are on show.
The scarcity of supply of raw materials during and after the war have made more difficult than ususal the
extraordinarily complex and delicate processes of manufacture. Shortage of labour and supplies has
had the effect of retarding expansion of output. They are also exhibiting some of their standard street lighting
lanterns and equipment. A striking exhibit shows the development during the year of the application of totally
reflecting and refracting glass prisms, which aroused so much interest when displayed for the first time
at the Conference in Glasgow. Preliminary quantities of these ingenious devices will be installed during the current
lighting season in certain selected lighting areas. - APLE Conference Programe 1946
Are exhibiting, in standard lanterns, the simplest, most economical and more effective method of redirecting light
ever devised for street lighting units. This consists of a combination of triangular glass prisms (Burman patents)
utilising to the full the optical properties of refraction and simple and total internal refelction, thereby increasing the
candle power in the vital zone beween 70° and 80° from the vertical as well as over a wide area extending
40° into the road by 160%. The measured candle power - 200 at 80° from a four-light No. 2 mantles alignment burner - is
increased to 345 by the use of the lower prism and to 510 by the combined use of the lower and upper prisms. The fitting of these
is simple and authomatically correct. The prisms are easy to clean and replace, do not tarnish or corrode, and possess the lowest
depreciation factor of any known type of reflecting or refractor device. The glare-free redirection of light is effected
with the complete avoidance of shows, and no light is cut off from the fronts of buildings. The general adoption of Burman
prisms for use with existing lanterns will soon result in an all-round improvement in the lighting of residential roads to
Group "B" requirements. Described as 'a new method of light distribution' by The Gas Council. - APLE Conference Programe 1947
References:
The Illuminating Engineer 1928
APLE Conference Programme Folkestone 1937
APLE Conference Programme Glasgow 1945
APLE Conference Programme London 1946
APLE Conference Programme Southport 1947
- External Links:
- Grace's Guide
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