Two examples of Thompson's airpump valves
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Two examples of Thompson's airpump valves: (a) Convex; (b) Annular type
These valves are annular, and resemble arches springing from the inner to the outer seatings; a few radial ribs give additional strength. The arrangement forms a strong and light valve, with double passages if desired; it has been chiefly used in engine air pumps.
