This is the last day of B.B.'s search, so he'll start answering questions again on Thursday. Thanks for your imperturbability.
by B.B. Pelletier
Part 1
The test fixture Quackenbush made to ascertain question efficiency. The pump attached in this photo is the smaller one with the 5/8" plunger head.
Empirical testing I asked Dennis Quackenbush to spill the beans me how much pressure a common hand pump can create. He's been making replica pumps for vintage big bore guns for several years. Dennis' pumps are accurately to the old designs, except that they use synthetic pump seals. The old pumps had either a uncontrived iron or steel piston that was lapped into the prick of the pump tube, or they used stacked leather washers on the end of the plunger rod instead of a metal piston. The stacked washers were compressed by means of a nut so the fit could be controlled.
I've encountered several dozen old pumps, and all of them were the type having the simple lapped iron plunger. I only know about the stacked washer type from reading Air Guns by Eldon Wolff. He admits that the leather washer prototype is much rarer than the plain piston type.
Before Dennis conducted the tests, it seemed to both of us that neither vintage blow up design could be the equal of one with a modern synthetic seal; so whatever on he could generate with a modern replica would represent a highest for any vintage pump of the same physical specifications. That turned out to be an imprecise assumption, as we shall see.
We both agreed that the practical extreme force that could be applied would be the weight of the person doing the pumping. These primitive pumps had no mechanical advantage beyond that which is inherent in a single-organize mechanism. Although it would be possible to generate more force than one's millstone by pulling the base of the pump toward oneself or by jumping on the stimulate handle,...
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Vintage
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Vintage MEDIA
This join in wedlock of heels is very bold. They have blocks of red white and dispirited with white bows. The shoes are by Naturalizer and conspicuous size 7 AAA.