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Aviation History
1917
1917 - 0170.PDF
1/llGHTl can be little doubt that as regards the main idea they will not be far out. It is an enterprise for which Messrs. C. C. Wakefield and Co., Ltd., and Mr. Frank Fisher, who is in charge of their motor and aviation department, are to be heartily complimented. THE many friends of Mr. G. S. Mainprize, who has for some time been Office Manager of the Fairby Construction Company, will be interested to hear of his appointment to a similar position with a well-known aircraft firm in the North of England. H H H H A NEW PROPELLER BORING MACHINE. ALWAYS on the alert with a view to discovering new fieldsthat offer scope for improvement, Me srs. Wadkin and Co., Leicester, the well-known manuf icturers of woodworkingmachine tools, have realised the urgent necessity of a machine for boring and recessing propeller hubs. An operation ofthis kind requires the greatest accuracy if the propeller is to run true and without flutter, and after a considerablenumber of experiments the conclusion has been arrived at that to successfully meet these requirements a machine mustbe specially designed for the job. The manner in which Messrs. Wadkin and Co. have donethis is illustrated in the accompanying photograph, which shows th ;ir new propeller boring and recessing machine.This-.is "designed on the vertical boring bar principle, experi- ments having shown that this form was the most reliablefor obtaining the necessary accuracy. The boring bar is mounted on a No. 4 Morse taper chuck, and has a screwedend which ensures the tightening up and centring of the The new Wadkin propeller boring and recessing]machine. bar" A plain fly cutter is secured in a slot in the bar, andan adjustable recessing cutter-block is screwed to the bar, the position being adjustable to suit different depths ofpropeller hubs. The spindle that carries the boring bar runs in ball-bearings of a heavy type and carried by abalanced sliding sleeve controlled by a hand wheel. The other end of the boring bar runs in a bush which iscarried in a ball-bearing recessed into the table, and the exact depth of the recess in the propeller is regulated by astop. The machine is very easy to operate the overhanging arm carrying the spindle being raised and lowered by power FEBRUARY 15, 19I7. controlled by a lever in front of the table, thus providingan easy means of setting and withdrawing the boring bar for each propeller. Another time-saving feature of themachine is that the boring and recessing are done simul- taneously, thus avoiding the necessity of changing tools. For ordinary recessing, trenching and shaping, a com-pound table is provided, and thus equipped the machine forms an extremely handy tool for halving in the case ofthree-bladed and four-bladed propellers. H H H H TWO "FORWARD" SPARKING PLUGS. THE accompanying sketches show two plugs which havebeen produced for use on aero engines by the Forward Motor Co. of Birmingham. The smaller of the two is the type " R "for use on rotary engines. Its dimensions have been kept as'small as possible—the length being 2 ins.—and thebody is of steel with a brass bushing forthe central elec- trode. The insula-tion is of the finest quality mica. In the other plug,for use on stationary engines, a somewhatunusual method of cooling has beenemployed. Four circular copper washers are placed in position over the bodyof the plug, below the spanner grip, in between each of which is a smaller washer, so that they are kept separatedand thus form cooling fins. The body of the plug is of . steel, the insulation of mica, and the central electrode Kbent towards the walls of the plug to form the spark gap. The overall dimensions of this plug are i.J ins. diameter and21 ins. long. H H H E NEW COMPANY REGISTERED. UNITED MOTOR AND GENERAL INSURANCE.CO., LTD.—Capital £ioo,ooo s in £1 shares. Insurers of allconveyances travelling on the ground, through the air, or through or under the water. First directors : A. N. Nobbs,H. Moore, A. R. Atkey, B. Coathupe, R. Winn, R. Woodbread and C. W. Phipps.H H H H IMPORTS AND EXPORTS, 1916-1917. AEROPLANES, airships, balloons, and parts thereof (not shown separately before ioio). For 1910 and 1911 figures, see " FLIGHT " for January 25th, 1912; for 1912 and 1913, see "FLIGHT" for January 17th, 1914 ; for 1914, see "P'LIGHT" for January 15th, "1915 ; for 1915, see "FLIGHT" for January 13th, 1916; and for - 1916, see "FLIGHT" for January nth, 1917. Imports. Exports. Re-Exportation. 1916. 1917. 1916. 1917. 1916. 1917.£ £ £ £ £ 4 ' January... 1,009 10,842 6,399 67,033 NiL Nil. It you require anything pertaining to aviation, study I " FLIGHT'S " Buyers* Guide and Trade Directory, I which appears in our advertisement pages each week. FLIGHT. 44, ST. MARTIN"S LANE, LONDON. W.C. Telegraphic address : Truditur, London. Telephone: 1828 Gerrard. SUBSCRIPTION RATES. FLIGHT " will be forwarded, post free, at the following rates :— UNITED KINGDOM. ABROAD. d.s. d. I • s.3Months, Post Free.. 2 2 ! 3 Months, Post Free 3 3 6 ,. .. .. 4 4 I 6 „ ,,..6 6 12 „ „ .. 8 8 ! 12 „ .... 13 o Cheques and Post Office Orders should be made payable to the Proprietors of " FLIGHT," 44, St. Martin's Lane, W.C., and crossed London County and Westminster Bank, otherwise no responsibility will be accepted. Should any difficulty be experienced in procuring " FLIGHT " from local newsvendors, intending readers can obtain each issue direct from the Publishing Office, by forwarding remittance a* above. IJO
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