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Aviation History
1944
1944 - 1403.PDF
FLIGHT Adveri'sements. 9 KNEW I T THAT COUNTS ROMAN BRONZE HAND PUMP 1st CENTURY. Hydraulics is an old science and the ancients were fine craftsmen in metal: Only a combination of good design with constructional skill could have produced such a pump as that shown above, in an age when precision machinery was unknown. The DUPLEX hand pump represents the latest development in small high pressure pumps and is designed to reduce the time and work required for the manual operation of hydraulic circuits. The DUPLEX comprises two double acting pumps, one having twice the stroke of the other: When pressure rises to a given point the load automatically cuts out the long stroke pump, allowing the operator to carry on pumping with reduced delivery to a higher pressure. The old disadvantage of having to operate for lengthy periods when work is easy, in order to obtain the necessary pressure when work becomes hard, is thus overcome. PERFORMANCE rrik. I pump (cut-put pressure 550 lb. per square inch) pressure lb. per sq. in. 550 ' 1,500 2,400 handle load at 14 in. R. 30 30 48 c.c. per double stroke 22 7 5 7-5 mk. II pump (cut-out pressure 400 lb. per square inch) pressure lb. per sq. in. 400 1,130 1,800 handle load at 14in. R. 30 30 48 c.c per double stroke 28 9-5 9 5 TURING COMPANY LIMITED WOLVERHAMPTON
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