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Aviation History
1938
1938 - 1220.PDF
428 FLIGH1 APRIL 28, 1938. The Lodge radio-screened plug, first to be made in England with the screen forming an integral part of the plug itself, is scientifi- cally designed and is claimed to be com- pletely cpaqv.e to electrical radiation.., The materials used make the plug suitable for all aircraft, including seaplanes, the plug and eable fittings; lieing rain- and spray-proof an;l resistant to the action of salt atmo- sphere. Alternative -cable fittings can be supplied, e.g., for conduit-type, screening h.irntos or for metal-braided cable. MARCO NTS. WIRELESS TELEGRAPH COMPANY, LTD., ELECTRA HOUSE, TEMPLE PLACE, LONDON, W.CJ2.—Among the special- ised accessory equipment developed by the Marconi Company during the last twelve months the most important, without doubt, is the Unking apparatus which enables the wireless direction finder to be utilised in connection with the P.B. Deviator auto- matic pilot. Among the possibilities of this devicfl is its obvious value to air survey companies in assuring that aerial photographs are taken with the greatest accuracy on a predeter- mined line. In relieving the pilot of unneces-: sary duties and enabling him to devote his attention to navigation and to have periods of rest, from the strain of long spells at the controls it may also come in time to be a standard fitting on airline machines. Fur- ther, it may yet prove to be an approved means of holding an aircraft on to the track of approach and landing beacons. The Marconi Company have also done some valuable working during the last year on the study of bad-visibility landing prob- lems. They have carried out some very in- teresting experiments with altimeters and have developed an ultra-sensitive, model which, it is stated, is free from hysteresis and temperaturei^ TricolouredlS?-* '•' MECHANISM, LTD., 6a, GECIKTJB STREET, CROYDON, SURREY.—For some years past this iirm has been steadily consolidating its position as manufacturers of aeronautical instruments. Its tricoloured navigation lamps are known the world over under the name Q! "Derrtee." Another of it= products m the shape of a preset landing light ol very light construction is also well known. Also, for a number of years the design and construction of gyroscopic instruments has been concentrated upon, and an artificial horizon, together with various types of direc- tional gyroscopes and pitch azimuth indi- cators, have been produced; the manufactur- ing rights are vested in Smiths Aircraft Instruments. DAVID MOSELEY AXD SONS, LTD., CHAPF.L FIELD WORKS, AKDWICK, MANCHES- TER. 12.—Special aircraft seat cushioning em- bodying the firm's famous " Float-on-Air " principle has been developed for air-line work, and is fitted in the Empire flying boats. Koll and bounce in bumpy weather, it is claimed; is eliminated, as the seat is divided into four tubular portions, each com- municating with the other by a slow-acting air valve. The cushions are remarkably low in weight, the seats in the Empire boats weigh- ing only 1 lb. 8 oz. and the backs 12 oz., making a total of 49 lb. 8 oz. for the twenty- two seats. These seats are convertible into mattresses for night-flying and also act as efficient lifebelts for emergency use. NATIONAL BENZOLE CO., LTD., WEL- LINGTON HOUSE, BUCKINGHAM GATE, LONDON, S.W.i.— The yellow wing-headed pumps of National Benzole Mixture are familiar on almost every British aerodrome. Particular advantages of benzole, it is claimed, are its quick response to the throttle and high volatility. The latter causes it to vaporise immediately in the cylinders even at very low temperatures, thus ensuring easy start- ing. Th" close connection which Kational Ben- role has with coal, iron, steel and other Staple industries of Great Britain greatly in- fluences its popularity among flying people and motorists. NEGRETTI AND ZAMBRA, 38, HOLBORX VIADUCT, LONDON, E.C.I.—This world- famous firm of scientific instrument makers 's responsible for an extensive range of air- craft instruments, among them being some cf special interest to the commercial opera- tor, which are very fully described and illus- trated in a recently issued catalogue. Items include air temperature thermo- meters (mercury-in-steel and nitrogen-filled), boost gauges and diaphragms, fuel and oil pressure gauges, oil temperature, air-intake and radiator thermometers and precision altimeters. OLDHAM AND SONS, LTD., DENTON. MANCHESTER.—Built throughout to meet all requirements of Air Ministry specifications, Oldham aircraft batteries are made in two 2-volt, one 6-volt and three 12-volt types. Discharge curves published by the makers indicate unusually high efficiency under heavy duty. P:B. DEYIATOR, LTD., 42a, SYDENHAM ROAD, CROYDON.—The P.B. automatic hydraulic control apparatus is an automatic pilot of which simplicity and efficiency are the keynotes' The total weight is under 60 lb., and it is stated that the only main- tenance required during a year consists of oil replenishment and filter cleaning. Its duties, efficiently -performed, are those ex- pected of a good automatic pilot, e.g., reliev- ing the pilot of physical strain and leaving him free to attend to navigation; increasing passenger comfort in bumpy weather; and keeping the aircraft on an accurate - course for aerial survey work. ' .' ;. A notable development is the successful association of this automatic pilot with radio control from a ground station; a reference to this development will be found in the Marconi paragraph in this review. .THE PALMER TYRE, LTD., THAMES HOUSE, MILLBANK, LONDON, S.W.I.—la addi- tion to its full range of landing equipment the Palmer Company is now making a num- ber of useful and interesting accessories, in-' eluding non-slip rubber matting, rudder-bar toe-straps, inspection-hole covers, footrests, etc. The Company is in a position either to develop designs suitable for standardisation or to meet individual requirements. The comprehensive range of Palmer tyres, wheels and brakes is well known throughout the industry, and it is interesting to note that 1938 ih thy twenty-fttth anniversary of " Safer Landings gn Palmer Tyres," the first specially designed tyre and wheel unit for aircraft having been made in 1913. The latest Palmer power hydraulic brake controls have been fully approved by the Air Ministry-. PETO AND RADFORD, 50, GROSVENOR GARDENS, LONDON, S.W.I.—Both " aero- batic " and " non-aerobatic " aircraft bat- teries are manufactured by this firm, but only the latter category, of course, concern the commercial operator, as does the " Dagenite " ground-starting battery de- scribed under the heading of "Ground Equip- ment " in our recent Airports Number. It is stated that " Dagenite " accumula- tors are fitted almost exclusively as original equipment by British aircraft manufacturers, and the makers have been supplying the Air Ministry for over twenty years. There are many special features embodied. Cartridge Starting PLESSEY CO., LTD., V,c U<AGF LANE, ILKJKD.—Apart from the ra«liu equipment with which it made its name in the aviation world, the Plessey Co. is now responsible in this country for such well-known accessories as the Coffman cartridge starter, Breeze ex- haust gas analyser and Pesco pump*. Some of these items were briefly il<-.« ribed in Flight of April 14 last. R. B. PFLLIN AXD CO.. LTD., PHCEXIX WORKS, CRFAT WEST ROAD, BRENTFORD, MIDDLESEX.—-In designing the Pullin elec- trical turn indicator, it was the object of the manufacturers to produce an indicator which would lie free from the disadvantages in- herent in venturi-driven instruments (e.g., ice formation, entry of moisture, foreign matter, etc.), but at the same time to provide one which, though electrically operated, could be placed in close proximity to the compass; By means of a patented form of motor all troubles previously existing have been over- come. The instrument is compact, light and simple in ooeratinn It is designed to be flush fitting and to occupy little space on the facia board. RADIO TRANSMISSION EQUIPMENT, LTD., NEW ROAD, MITCHAM JUNCTION, LON- DON, have produced a transmitting and receiving apparatus which is capable of adap- tation to many different conditions, although the separate units are standardised and, therefore, can be sold at a price within reach of the small airline operator. This equipment is particularly suitable for in- ternal lines and charter companies. The basic apparatus and its variants are designed for transmission of C.W., M.C.W. and telephony over a wave range of 600 to 950 metres with seven-spot waves in that band. The power output is 45 watts C.W. telegraphy and 12 watts telephony and M.C.W. The receiver has a wave range of 600 to 1,545 metres and has single-knob tuning con- trol. The sensitivity is 4 to 6 microvolts for full output in headphones, which will ensure good reception under adverse conditions. The equipment can be used with fixed or trailing aerial. The total weight of the transmitter and receiver equipment does not exceed 26 lb.. with an additional 2 1b. for the remote-control unit, and 35 lb. for the rotary transformer, when these are required. RAGOSINE OIL CO., LTD., WOODHOUSE LANK, LEEDS, 2, one of the oldest lubricating oil manufacturers, have within recent years built up a complete service for the aviation industry. They supply oils and greases to all D.T.D. specifications. The operator will be interested in pene- trating oils, in " Rust Cut," rust preventives and hydraulic brake fluid, and, of course, in " Minix " aero oils (approved by the Air Ministry and leading engine manufacturers). Tl Ingenious RECORD ELECTRICAL CO., LTD., AITRINCHAM, CHFSHIRE, manufacture elec- trical r.p.m. indicators for aircraft. The Record indicator is simple in conception, con- sisting primarily of an engine-driven genera- tor and a voltmeter which acts as the indi- cating unit. The indicator can be placed at almost anv distance from the Kenerator, since the resist- ance of the leads is negligible; it can also be duplicated without extra complication. It is stated that the only attention re- quired is cleaning of the commutator after 500 hours. REID AND SIGRIST, LTD., SHANNON CORNER, NEW MALDEN, SURREY.—Pioneers in the design and manufacture of the turn indi- cator as we know it at present, this firm has also developed a combined turn and lateral level indicator known as the Gyorizon. By the simple expedient of extending the turn needle, adding a pair of "wings" to it, and arranging for a visible liquid lateral horizon in the dial immediately behind, the firm has produced an instrument which, while providing all the essential indications in a fairly easily understood form, may also be used for flying in all possible attitudes, including the inverted position. With either the standard turn indicator or the Gyorizon it is usual to fit a fore and aft level or pitch indicator, and that pro- duced by R. and S. is one ol the best-known examples. R.F.D. CO., LTD., STOKE ROAD, (Juan- FORD, SIRRKY.—Among the endless array ol items, mostly of the fabric, wire and rope variety, made by this firm, several are of particular interest to the commercial opera- tor, as, for example, marine gear (sea anchors, etc.) for flying boats, and, in the case of passenger cabins, safety belts. ROTAX, LTD., WILLESDKN JUNCTION, LONDON, N.W.10.—Chief among the items in the latest Rotax catalogue of interest to the commercial aircraft user are magnetos, generators and starters. A rotating-magnet machine fitted with the new Alnico magnet is supplied for the Pob- joy Niagara engines. For larger engines there is the now well-tried S.P. <M> magneto, ; which has been adopted for the Pegasus lot- These magnetos are giving excellent service on the Empire boats. A new o-cylinder maR- neto for the Perseus 12C, to be used o» the new D.H.95, will be available shortly 500-watt and 1,000-watt Rotax engine-
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