the draw four lines; parallel with the first four corner lines, previously glued surfaces into close contact and make two of which are ¥% of an inch distant from the outside a permanent light-tight joint. When the joint is-per- of the two center corner lines, and the other two ¥% of fectly dry,… … sheet. - Fig. 7.-TRUNCATED CORNERED PYRAMIDAL BELLOWS, Fig. 2 illustrates the way the lines are creased, which may be done by drawing and pressing the point of a ling and bending in the creased portions, continuing tooth brush handle or a carpenter’s square lubricated the manipulation on each…
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