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J. L ROUTIN.
FIRE CONTROL TACHOMETER APPLICATION FILED JULY 25 1917.
. Patented July 6 1920.
UNITED STATES PATENT OFFICE.
JOSEPH LOUIS ROUTIN OF PARIS FRANCE.
FIRE-CONTROL TACHOMETER.
. Specification of Letters Patent. Patented July 6 1920.
Application filed July 25 1917. Serial No. 182 789.
50 4 and mounted so that it can rotate on the
To all whom it may concern:
Be it known that I. JOSEPH Lotus BOUTIN
a citizen of the French Republic residing at
2 Rue Olchanski Paris France have in-5 vented a new and useful Fire Control Tachometer which is fully set forth in the following specification.
The present invention has for its object to provide a particular form of embodiment of a tachochronometer based on the principles defined in my application for patent Serial No. 182 311 filed July 23 1917 now Patent No. 1 345 697 dated July 6 1920 and enables the determination of the product of azimuthal or zenithal velocity of an aerial objective by the time of flight of the pro-
jectile. In the following it will be assumed for instance that one has to determine the product of the azimuthal speed of the aerial target by the time of flight of the target which will be designated respectively as in
the principal application by d and t2.
25 In the annexed drawings Figures 1 and 2 show the details of the apparatus. Fig. 1 is a front view and Fig. 2 a section through line A B of Fig. 1.
1 is a permanent magnet mounted on the 30 hollow shaft 2 driven by the pinion 3 at a
speed proportional to dt resulting from
the angular movements of a sighting de-vice through suitable multiplying gear. Such means are diagrammatically indicated at the right of Fig. 1 consisting of a sighting telescope Li L2 operated by a handle M through worm gearing N. Multiplying gears OP and worm Q transmit the move-40 ments to the tachometer gear 3.
4 is a soft iron core having as shown in the drawing the form of a cylinder cut off on two planes parallel to its axis. This cylinder is integral with a rod 5 on which is
45 mounted a toothed sector 6 which engages with the screw 7 which rotates in bearings fixed on the pinion 3.
8 is a cylindrical copper bell housed in the annular space provided between 1 and
ends of the axle 9 ; this bell is integral with a pointer 10 which moves over a graduated dial 11. Two spiral springs 12 constantly
Be it known that I JOSEPH Lours ROUTIN position. 55
The axle 9 is integral with a support 13 which supports the dial 11 and which rests on a plate 14 guided in the fixed slide 15. By means of a screw 16 provided with a graduated dial 17 which is rotatable before 60 a fixed point 18 the support 13 the index 10 the dial 11 and the bell 8 can be simultaneously displaced with respect to the frame supporting magnet 1 and its core 4.
The device forms a magnetic tachometer 65 indicating the orientation of the core 4 with respect to the magnet 1 and also of the ex-tent of movement of the bell 8. To gage the apparatus the screw 7 is operated. The dial
17 is experimentally graduated either in 70 time functions of the flight t2 or in functions of the distance D.
The device thus far described operates in the following manner :
The position of magnet core 4 is adjust-able to give the desired strength of field between the poles of magnet 1 and the core by turning screw 7 which engages the toothed sector on magnet rod 5. Pinion 3 assumed to be driven at a speed propor-
tional to the azimuthal speed dt rotates
magnet 1 and magnet core 4. Copper bell 8 is thus subjected to the action of a rotating magnet field and is angularly deflected in 85 the same direction to an extent proportional
to speed dt • If however the bell 8 is
moved by aid of screw 16 to cut more magnetic lines there will be a greater torque on the spring-opposed dial hand 10 for the
same azimuthal speed dt . By moving
screw 16 proportional to duration of flight t2 while pinion 3 rotates at the azimuthal speed
dt the index 10 will move proportionally to the product of time and speed or t2 dt
Although not indispensable it is prefer-able as in the principal application to automatically control the displacement of sup-port 13 by means of a mechanical transmit-ter connecting the tachochronometer with the telechronograph post.
75 80
90 95 100 105
S
2
To arrive at the corrections which do not
depend on the speed of the target it is suf-
ficient to rotate the dial 11 with respect to
the fixed point 19 arranged opposite the po-
5 sition assumed by the index 10 when the
speed dt is zero. For this purpose the
lever 20 is actuated.
What I claim as my invention and desire 10 to secure by Letters Patent of the United States is :-
1. In chronotelemetrical apparatus for regulating the firing of anti-aircraft guns a magnetic or electromagnetic tachometer
15 wherein the flux is varied so as to indicate the product of a speed by a time the device being so arranged that it can be gaged by bringing the maximum flux to a constant value by means of independent regulating
20 means.
2. In chronotelemetrical apparatus for regulating the firing of anti-aircraft guns a magnetic or electromagnetic tachometer
wherein the flux is varied so as to indicate the product of a speed by a time comprising 25 a revoluble magnet and core an induction element revoluble under the influence of said magnet and adapted to be angularly displaced in proportion to the speed of rotation of said magnet means for adjusting 30 said element in the flux of said magnet while the magnet rotates thereby varying the inductive action on the element and its displacement in proportion to a time and means for adjusting said core in respect to 35 the poles of said magnet to regulate the flux to a predetermined value for acting on said element.
In testimony whereof I have signed this specification in the presence of two sub- 40 scribing witnesses.
JOSEPH LOUIS ROUTIN. Witnesses :
HENRI MONIN CHAS. P. PIE ssLY.
