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Excerpt from Power Developed by an Hydraulic Ram: A Thesis
As a rule considerable difficulty ls met With In the opcration of hydraulic rmas in keeping sufiicient air In the air chamber. The water leaving the air chamber absorbs a comeld - erable amount of air, thus gradually removing it all unless constantly replenished. In the Deming rams provision is made for automatically aectlng a small amount of air into the air chamber each stroke. This is accomplished as follows.
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