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Aviation History
1912
1912 - 0943.PDF
OCTOBER 19, 1912. [/QCHT Two views of the 100-h.p. Hanriot monoplane. ' Flighi " Copyright. They have the refinement that provision is made whereby they may be folded, for convenience sake, along the side of the fuselage. The upper cabane has a very good point about it. The top wires from the wings pass through a fitting which may be adjusted in relation to the cabane skeleton. By this system the top wires can be dismantled very easily and their tautness can as simply be varied. The stabilizer is imade so that it may fold down readily in two halves. Each half is hinged to a tube running parallel to, and on a level with each top member of the fuselage at the rear. It is kept up in place by wires when in use. The rudder, too, folds in neatly. Naturally, when a new machine makes its appearance, everyone who has anything to do with aeroplanes makes it his business ® ® to " quizz around," criticise and communicate the result of his inspection to anyone who may be similarly interested. Everyone on the Plain had a good look round the Hanriot, but, for once, no criticism reached our ears. But there, perhaps, we are wrong—we heard one of the official passengers in the three hours' duration test relate that his neck had got seriously out of truth through having to resist, for such an extended period, the pressure of the relative wind. The 100-h.p. Hanriot monoplane averages a speed of about 73 m.p.h. Main characteristics :— Length 24 ft. Span 41 ft. 9 ins. Weight without comple- Motor ... 100-h.p. Gnome ment or fuel ... 981 lbs. Propeller, Chauviere 2-55 m.diam. ® ® THE "TEL" REVOLUTION INDICATOR FOR AIRCRAFT. WE show in the accompanying illustration an ingeniously designed instrument which is new only in the sense of its latest application to aircraft. The " Tel " indicator, as it is called, is manufactured by the Haslar Telegraph Works, of 26, Victoria Street, London, S.W., and is designed for indicating the revolutions per minute of engines or propellers of aeroplanes or airships, and it is similar in its principle of working to the "Tel" instruments manufactured for use on locomotives and tramcars, in which connection they are well ^known to engineers. One feature that is of considerable importance in connection with aeroplanes is that the indicating needle is re-set every second if the speed is not absolutely constant, thereby giving a correct indica tion of the speed of the engine or propeller at all times. The two views on the left of our illustration show the instrument complete, together with the gear-box as is used in a Gnome engine installation ; while on the right is a view of the interior of the instrument, showing the mechanism as seen when the back is taken off, and below the component parts of the gear-box are illustrated. In the case of a slow-running engine, the instru ment can be connected direct, without the gear-box, and, of course, it all depends upon the make and position of the engine as to what part of the latter the drive is taken. We understand that several of these instruments are already in use on aeroplanes, both at home and abroad, one being fitted to the Hanriot that recently took part in the Military Com petition. The "Tel" revolution indicator, as fitted to a Gnome engine, when a gear-box has to be used. The photographs on the right show the interior of the instrument and the gear-bcx taken apart. 943
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