ugh the the stream as far as the weight of the metal will carry it. ing room. Here are ingenious machines which stamp upon In compartment ¢ The air lock which caps the cylinder consists of two them the red numbers denoting series, etc. The apparatus heavy cast iron circular plates of the same… … it out from under the lower edge of the cylinder; or, in case HOW POSTAGE STAMPS ARE GUMMED, rm the bottom of the column is sunk ina stratum of mud im. To return to postage stamps. As soon as they emerge a il pervious to water, the contents are expelled through the water from the hydraulic press,…
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