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    • 72. 发明专利
    • Improvements in or relating to vacuum tube amplifiers
    • GB688273A
    • 1953-03-04
    • GB466850
    • 1950-02-23
    • WALLACE HENRY COULTER
    • B07B13/065H03F3/32H03F3/44
    • 688,273. Valve amplifying circuits. COULTER, W. H. Feb. 23, 1950 [March 21, 1949], No. 4668/50. Class 40 (vi). In an amplifier comprising two valves with their anode-cathode paths in series for D.C., the grids being driven in push-pull and the output load 62 being connected between a point of zero A.C. potential and the point 60 which is common to the cathode circuit of the one valve and the anode circuit of the other, the valve 54 is driven directly from the input and the valve 541 over a phase-reversing valve 67; negative feed-back in the valve 54 1 due to valve 54, which forms an impedance in its cathode circuit, is counterbalanced by positive feed-back obtained by returning the cathode of the phase-reverser 67 to a potentiometer 71 across the output load. In another embodiment, Fig. 2 (not shown), the grid connections of the valves 54, 54 1 are reversed, so that valve 54 is driven via the phasereverser; the feed-back from the output to the phase-reversing valve is then negative in nature, being made to equal the feed-back on the valve 54 1 due to the presence of valve 54 in its cathode circuit.
    • 76. 发明专利
    • Improvements in treads for pneumatic tyres
    • GB303765A
    • 1929-01-07
    • GB2653727
    • 1927-10-07
    • DUNLOP RUBBER COWALLACE HENRY PAULL
    • C08J5/02
    • 303,765. Dunlop Rubber Co., Ltd., and Paull, W. H. Oct. 7, 1927. Latex, treating; indiarubber compositions containing cellulose derivatives.-Rubber goods are made by electrophoresis and/or dipping from rubber &c. latex with which is admixed a viscose or oxycellulose solution. A 5-10 per cent solution of viscose is suitable, and there may be 25-50 per cent of viscose in relation to rubber content. Dispersions of fillers, vulcanizing agents &c. may be added. The invention is particularly applicable to the manufacture of boot solies and heels which may be cut from sheets, or deposited on patterned formers, and tyre treads, with or without side walls, patterned surfaces, &c., and which may be made on drums as endless bands, or as straight lengths of the required size, or in a continuous length to be cut up. The thickness may be varied by screening &c. Fabrics may also be coated, and parts of machinery. The deposit may be milled with other rubber &c. to introduce viscose into the mix.