| http://www.w3.org/ns/prov#value | - I find it more convenient, practical, and preferable to hold the valve open by the magnetic influence and to permit it to close by gravity, assisted, if desired, by a spring or other means, instead of holding it closed by the magnetic influence and forcing it open by a spring or equivalent device; but it will nevertheless be understood that this latter arrangement is but an obvious reversal of. th
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