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    • 5. 发明专利
    • Improvements in or relating to fluid metering apparatus
    • GB865069A
    • 1961-04-12
    • GB2779557
    • 1957-09-03
    • WALLACE HENRY COULTERJOSEPH RICHARD COULTER JUNIOR
    • G01N15/12
    • 865,069. Electric tests. COULTER, W. H., and COULTER, J. R. Sept. 3, 1957, No. 27795/57. Class 37. In a system for counting the number of particles in a liquid a measured quantity is drawn through a small hole in a container, each particle interrupting an electric circuit, the interruptions being counted. In the arrangement shown, the liquid 58 is drawn through a small aperture 47 into a further container 41. As each particle passes through the aperture it interrupts the conductive path between electrodes 50, 54. The liquid is drawn in by the mercury siphon arrangement comprising reservoir 26 and capillary tubes 20, 21, 28. Initially cock 13 is open and the mercury is drawn up into the reservoir by suction applied at tube 12. The cock is then closed and the mercury tends to equalize the level in the two branches 20, 21 drawing further liquid 58 through aperture 47. When the mercury reaches contact 32 in a branch 28 of the capillary tube it sets the counter mechanism 39 which is then able to count each passage of a particle through aperture 47. Counting continues until the mercury reaches contact 31 when the counter is switched off. The volume of the capillary bore between contacts 31 and 32 represent the measured quantity of the sample liquid drawn into tube 47. The configuration of the branch (shown in plan in Fig. 2) ensures that the suction head remains substantially constant throughout the measuring operation. Specification 865,069 is referred to.
    • 7. 发明专利
    • Improvements in or relating to indicating devices or apparatus for use with pneumatic tyres
    • GB201199A
    • 1923-07-25
    • GB869822
    • 1922-03-25
    • DUNLOP RUBBER COWALLACE HENRY PAULLFRANK FELLOWES
    • B60C23/04
    • 201,199. Dunlop Rubber Co., Ltd., Paull, W. H., and Fellowes, F. March 25, 1922. Puncture or deflation, indicating.-Apparatus adapted to produce a signal on the tyre pressure falling below a predetermined limit comprises a casing secured to the valve body A, Fig. 1, and formed of two parts B, B holding between them a perforated plate C above which is mounted a, rotary vane wheel C carried nn a spindle C . A coil spring D bears on the under surface of the plate C and on a shoulder of a pin D' which bears on the valve A . When the tyre pressure fall the spring extends and causes the pin D to open the valve A the escaping air causing the wheel C' to revolve and produce an audible signal. A thin disc of waxed paper may take the place of the plate C, a coil spring acting on one side of the disc against the air pressure on the other side. On the tyre pressure falling the disc is broken and air escapes through a whistle. In the modification shown in Fig. 4 a coil spring is fitted round the valve and the valve body carries a casing G formed with a projection G . On a fall of tyre pressure the spring D extends and causes the valve to be drawn partially through the rim, the projection G engaging the jaws G of an electric switch carried on the fixed part of the vehicle and operating a bell, lamp or buzzer. In a modification the spring releases an arm when the tyre pressure falls. a torsional spring swinging the arm to contact with a switch on the fixed part of the vehicle.