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Re: Dowty's
Quote:
Originally Posted by susie123
Dowty or Dowty prop, the first British made hand operated hydraulic prop developed by Dowty Mining Equipment in 1946. By 1956 there were 400,000 hydraulic props and 200,000 yielding props in use. These were of tubular steel construction designed to be erected single handed and set by a pumping action using a pump handle. They were generally set to yield at about 15-20 tons bearing pressure.
Dowty
Pit Prop, 1950-1985 |
Thanks for this Sue -the Dowty link supports what mum said about the Aircraft industry. The patent was sold early 30's which also ties in! 
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