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Aviation History
1937
1937 - 0198.PDF
74 FLIGHT. JANUARY 21, 1937. route beacons, and neon identification bea cons. Osira lamps for works lighting, and various types of Osram lamps for aeronautical pur poses are also shown, together with G.E.C. cone-type boundary lights and obstruction lights. Landing floodlights, equipped with 1,000-watt or 3,000-watt tubular horizon-type Osram lamps with line filaments are shown pictorially. Peto and Radford, 50, Grosvcnor Gardens, London, S.W.I (Stand 15). The three main " Dagenite " items ex hibited are for ground starting of aircraft engines There is a compact transportable battery unit for ground-starting all types of engines operated by 12-volt starters. It is stated that the batteries fitted are capable of giving 489 consecutive 10-second " starts," at 100 amperes, on each charge, and will give as high an output as 600 amperes. Two ground-starting batteries, Type 6.EMD15.BR., are shown coupled in series tc operate at 24 volts, and can be supplied fitted in the trolley instead of the 12-volt batteries mentioned. Lastly, there is a six-volt ground-starting battery Type 3.NSDD23-R., which has a capacity of 300 ampere-hours and has been partially sectioned to show internal con struction. In addition, a range of Dagenite accumu lators for aircraft is shown. Tilley Lamps (Stand 12). Floodlighting: See under Airco, Ltd., in Miscellaneous section. Cardiff Foundry and Engineering Co., Ltd., Hurtnan Street, Cardiff. The clanger ol fire in the event of collision ol an aeroplane with an aerodrome boundary beacon is eliminated in the case of the " Pil lar of Fire " beacon. The moment an aircraft touches any one of the three supporting struts the strut breaks, the two remaining struts pulling the beacon away from the machine and at the same time breaking all electrical contact. The beacons (with their aviation orange globes) may be seen at Don- caster and Cardiff aerodromes or at stands A709 and A608 at the forthcoming British Industries Fair at Birmingham. Clarke, Chapman and Co., Ltd., Gateshead, Co. Durham. This firm manufactures aerodrome and air ways lighting equipment, such as beacons, boundary and obstruction lights, illuminated tee-type wind-direction indicators, flood- A Dagenite ground-starting trolley in use by Imperial Airways. Its twelve-volt batteries are capable of 489 10-second "starts" at 100 amperes on one charge. lights, ceiling projectors, wind velocity indi cators, strip-type landing fights, etc. In addition, they produce all classes of searchlights, low- and high-intensity pro jector lamps of the semi-automatic and fullv automatic type (the latter embodying their patent light control), generating sets, switch boards, motors and control equipment, etc. This firm has recently marketed a special stand-by generating equipment which can be arranged for automatic starting by light-sen sitive devices, automatic control device, or by failure of a main supplv. This set can be run for long periods unattended. B. Dixon-Bate, Bridge Works, Chester. Well known for their aircraft anti-fire im pact switches, which would appear to have obvious application to boundary lights, this firm is now manufacturing aerodrome beacons and lighting equipment generally. Martin-Baker Aircraft Co., Higher Denham, Bucks. The Martin patent wind indicator is a pro duct of this company. It measures 50ft. in length, is easily visible by day or night from 6,000ft., and is illuminated for night riving by twenty 40-watt lamps placed approxi mately 4ft. apart. The standard steel pylon support is about 12ft. high. Metropolitan-Vickers Electrical Co., Ltd. Workshop lighting and equipment: See tinder Workshop Equipment. Troughton and Young, Ltd., 143, Knights bridge, London, S.W.I. The work carried out by this firm of light ing specialists in connection with airport construction comprises the complete elec trical installation for lighting, heating, and power services, and lighting equipment in cluding industrial and ornamental fitting" Marconi's Wireless Telegraph Co., Ltd., Electra House, Victoria Embankment, London, W.C.2 (Stand 13). In the space available at Central Hall it is not possible to show the larger types of Marconi aerodrome equipment, but the fol lowing apparatus is exhibited: The Marconi-Adcock direction finder, type D.F.G.12 (short wave) utilises the Marconi- Adcock spaced aerial system, the special fea ture of which is that only the vertical mem bers are influenced by the received waves, thereby enabling bearings of a high degree of accuracy to be obtained during periods when " night error " would otherwise be experienced. The Marconi T.W.12 telegraph and tele phone transmitter is specially suitable for exacting requirements and extreme climatic conditions. The nominal rating of the trans mitter is 50-bo .watts to the aerial circuit for C. \V. telegraph transmission, or 25-30 watts carrier with 75 per cent. I.C.W. or telephone modulation. Its wave ranges are from 100- 250 and from 600-800 metres, but a modified medium wave range to cover 800-1,200 metres is also available. A medium-wave 65-watt equipment, the G.A.D.49, is an efficient low-powered trans- . mitter particularly suitable for local zone communication. One of these installations is in use at Gatwick. The GAD.41 transmitter, a medium-wave 170-watt aircraft wireless equipment, is also suitable for local zone communication, but in cases where rather more power is required. Standard Telephones and Cables, Ltd., New Southgate, London, N. (Stand 36). This firm is exhibiting a typical short-wave ground station, comprising a 200-watt type K 4 radio transmitter providing any four pre set frequency settings between 2.73 and 7.5 megacycles, together with a. type R 5 8-valve Standard-Adcock direction finder unit, type R3. superheterodyne radio receiver, giving any service between 1.2 and 22.2 megacycles. Associated rectifier ecpiipment for complete operation from alternating current mains is on exhibit. There is also a Standard-Adcock direction finding system, which is especially suitable for aerodromes where a direction finding accuracy within + 2 deg. under all condi tions is essential. The receiver, situated up to 200ft. from the centre mast, provides 300- 600 kc. normal reception, D.F. and J.73-&5 megacycles non-directional reception. A model illustrating the formation of the aerial system, together with methods of support, insulation and connection is on view-, to gether with a type R.3 Standard-Adcock receiver. Marconi- Adcock short wave direction finder, type D.F.G.iz.
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