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Updated: May 11, 2025
Who could say, when the perforators are numerous, to what lengths this accumulation can go? I will set forth on some future occasion how the ration of one egg remains in reality the ration of one egg, despite the multiplicity of banqueters. I will end by describing the egg, which is a white, opaque object, shaped like a much-elongated oval.
Knives, arrow-points and perforators of chipped stone are found in all parts of the continent. Beads and shells and pottery are also found in almost every State.
Each time that the insect, on finishing the operation, removed its probe, I marked in pencil the exact point at which the instrument was withdrawn; and I wrote down the date beside it. This information was to be utilized when the Leucopsis finished her labours. When the perforators are gone, I proceed with my examination of the nests, covered with my hieroglyphics, the pencilled notes.
Here we also find drills, awls, and perforators, slick stones and dressers, pipes of various forms and finish, discoidal stones and net sinkers, butterflys tones and other supposed ceremonial objects, masks or face figures and bird-shaped stones, gorgets, totems, pendants, trinkets, etc.
But Edison's work on the automatic did not stop with this basic suggestion, for he took up and perfected the mechanical construction of the instruments, as well as the perforators, and also suggested numerous electrosensitive chemicals for the receivers, so that the automatic telegraph, almost entirely by reason of his individual work, was placed on a plane of commercial practicability.
At the New York end there are connected with this wire four combined perforators and transmitters, and four receiving machines operating on the typewriter principle. At the Chicago end the wire is connected with a like number of sending and receiving machines.
Uprights, a a, of double T-iron, fixed to joists, k k, and connected and braced by pieces, d d, form a strong frame. The power necessary to run this kind of saw is less than n × ¼ H.P., on account of the number of passive parts. The most interesting application of the helicoidal saw is in the exploitation of quarries. Gay's method. Tubular Perforators. Mr.
But it does not give way; and the wire goes deeper and deeper. Raising itself high on its legs, to give free play to its apparatus, the insect remains motionless, the only sign of its arduous labours being a slight vibration. I see some perforators who have finished operating in a quarter of an hour. These are the quickest at the business.
They belong to that species of molluscous perforators which excavate holes in the hardest stone; their shell is rounded at both ends, a feature which is not remarked in the common mussel. Pencroft and Herbert made a good meal of the lithodomes, which were then half opened to the sun.
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