The operator actuates a typewriter form of perforator which punches varying groups of holes, representing the different characters, in a paper strip about one inch wide. [Please select]
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The piles are constructed by first ramming a hole in the ground by repeatedly dropping a conical "perforator" weighing some two tons. [Please select]
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This perforator is raised and dropped by a machine resembling an ordinary pile driver. [Please select]
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The perforator of clay nests has, so it seems to me, delivered us from an old physiological fallacy. [Please select]
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In one was found a long, perfect bone perforator, shown at a in plate 30; in another near the corner of the west wall was found the pipe shown in figure 14. [Please select]
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