THE CHINA-MAIL, THURSDAY, OCTOBER 20, 1949.
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司公限有店佥五资助
105, Des Voeux Rd., C.
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Tels:
(Opp. Central Market)
28147
ENGINEERING PAGE
PRESS BUTTON LIGHT HOUSES
By GEORGE HILLYAR
Lighthouses which need skilled attention only twice a year are being seat from Britain to re place older types that have been damaged by war action in the Far Fost One is going to
Cor- regidor, scene of the U.S. Army's last stand against the Japanese in 1942: others are being complet ed
for vital shipping routes in the Netherlands East Indies and British Borneo areas.
busy
Lighthouses, even, in traffic lanes, often have to be sited on remolc islands and promontories where only un- skilled labour is available.
The cost of maintaining a staff of resident engineers to attend to these lights would be prohibitive, ven if they were willing th live in such isolated spots.
Britain is now bulldica special "press button" light- houtes for On the
uze in remota places where only unskilled labour is available. Tep pit- ture shows the interior of a single flashing optic equipped with ал automatic famp
other hand. without complete reliability at all times, the lights would be utterly useless as navi gational aids in narrow waters,
The new lighthouses have there- fore been designed as completely self-contained units operated hy unskilled attendants or push- button control. The mechanisms need only periodicel examination b experts, usually at intervals frara six to eight months. There is even a device for telling the attendant when to push the bet- ton; and another for informing the visiting inspector where look for faults.
to
Each installation comprises an electric filament lamp, usually of about 1 KW consumption, e gris- matic glass "optic" and a rotat ing mechanism: all this is housed in a lantern-mounted upon a steel | framework tower.
ог
changer; this chu
cbviates the paccibility of
the lighthouse ceasing to function when one Filament fails. Right clock. work mechanism for retating the lamp is undergoing test To reduce rotationial' friction the lamp and lâns float in a bed of mercury contained in the trough shown at the top of the picture.
warns the
are
the
Light from the flament lamp is refracted and reflected by the prisms into the familiar hori
keeper to start
There is a third zontal beams, which, When the second set optic is rotated, sweep the horizon set in case of failure while the
in pairs, in
others threes
being overhauled according to the arranged signal Whatever the reason for the be which ships may recognise the failure it is automatically recor light Power is usually supplied ded on indicators so that the visit- by diesel-driven generating plants ing engineer knows where to look in triplicate, housed below the for trouble. tawer.
Sometimes the light may fail At lighting-up" time a bell-through burning out of the fla- worked be a photo-electric switchment lamp itself, which is the vital -rouses the keeper and keeps on point of the whole system. If it ringing until he has pressed the docs, a second lamp comes into starting button of one of the generators.
It' continues ringing until the Fower is generated and the light house is in complete operation. Further, if the keeper switches off before it is actually daylight, the bell rings again until he re- starts the engine and conse- quently the light.
The Light Never Fails
If for some reason the genera for itself should fail during the night which is actually a remote possibility the bell rings and
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MACHINERY & CONTRACTING
Hong Kong & Shanghai, Bank Bullding.
HSD Long
DEPT
Telephone" 28023
operation immediately and.
warning light, which cannot be extinguished until the faulty lamp is replaced, tells the keeper of its failure.
If the electric motor operating the optical apparatus should fail there is a second one which cones into action at once: again a warn ing lamp lights to indicate the breakdown.
Royal Navy Plans Bigger Gas Turbines
Suppliers of this apparatas are Chance Brothers Ltd., Smethwick (England) who claim to be the only firm in the world capable of *upplying a complete light-house from the founding of the glass to Following the success of the gas turbines installed
the manufacture of the electrical Machinery and Tower, and behind them the emeri
experience Di #eris century Lore the 40 orders have been received lately for installations in tropical waters alone, and in-some cases the system has been varied to meet local conditions.
Diesel System
For example, of the 16 lights ordered far the Netherlands East Indies, 10 are to have the diese! generating system described above. The other six however, because of difficulties of supply, are to be lit by petroleum vapour,
in the motor gun-boat 2009, Britain's Ad- miralty is planning larger gas turbine machin ery for installation in naval craft.
The motor gun-boat: 2009, the frst craft to pat to sea with ga turbine propulsion," is not entirely iet-propelled in the sense that she moves because of a jet Blowing out astern.
In the Gatrie unit, installed in the gun-boat, a turbine is actuated by a "jet" produced by the com- ponents of the type used in jet sircraft. This turbine drives a conventional propeller.
The further projects are having
These units comprise a pres sure burner and mantle fed by kerosene, and for a comparable a more advanced design. They are candle-power the lens is the optic designed as marine propulsion
then in the case of an electrically predicted that their durability and lit plant. Rotated by a clockwork efficiency will be much greater driven mechanism, the lens is than those of the Gatrie unit, with mounted in a trough of mercury which the gun-boat is equipped to reduce rotational friction.
Operational gas-turbine war- almost.
Again, in the case of two lights | ships can get under ordered for the West African Beat once without the long delays public of Liberia; one of them- of getting up steam. They consome for locating Monrovia's newly less fuel and have ‚“increïsed" built deep water harbour will
cruising range. normally be powered from the town's main electric supply. this should fail, however, diesel driven genersting set comes into operation automatically and cuts out again as soon as main cur rent is restored.
Work to introduce the gas- turbine engine for commercial ships is progressing rapidly at the Clyde Bank (Scotland) works of Messrs. John Brown and Company. Many components, have also been made by this firm for the insta- One of the most powerful light ration next year of the first in- is that to be installed at Corregi dastrial-gas-turbine of the closed
it has power half a Coricand of overbelerle type: It will operate the millio
the second new Carolina Part power station at approached by light on the Liberian mast, at Cape Palmer, which will be of 450,000 candle power and is DTO
It is believed it will be possible
bably the most Theortant one be to build a też power stations In. tween Sierra beze and Fernando various districts of England where
new industries "cofly bet créated.
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