ded screw, analogous to the screw pro- use. further information may be obtained. It was To ensure the tight fitting of puppet valves cult to make absolutely perfect in practice. peller employed on steam vessels. The patented October 28th, 1856. Self-acting valves are usually constructed to their… … or of a ball, to move at pleasure within a be tight surfaces, complex inventions have M. De la Rue, a celebrated manufacturer of the interior casting K. The threads ee are cage, or of a puppet, to jump vertically. The been introduced or proposed, at various times envelopes in London, has got an…
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