Ricerche sulla storia dell'Umanità e sullo sviluppo della civiltà . ds, come indicato con un chiodo o un ago di vela, ottenuto dagli stranieri,^ ma il campione da lui presentato al Museo Hunteriano di Glasgow ha un punto di pietra. Il nativesuse esso per perforare i loro pesci-ganci fatti di guscio; per cui pur-posa, come per perforare i fori in cina, è particolarmente adattato, la thelightness e l'uniformità della sua pressione che riduce il pericolo di cracking questi materiali fragili. Si potrebbe pensare che thisquahty renderebbe la pompa-trapano particolarmente inadatta forfire-making; ma, tuttavia, da

• Collaboratore: The Reading Room / Alamy Foto Stock
• ID dell’immagine: 2AN1RYW
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• Dimensioni: 1313 x 1904 px | 22,2 x 32,2 cm | 8,8 x 12,7 inches | 150dpi

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Researches into the early history of Mankind and the development of Civilization . ds, as pointed with a nail or a sail needle, got fromthe foreigners, ^ but the specimen presented by him to theHunterian Museum at Glasgow has a stone point. The nativesuse it for drilling their fish-hooks made of shell; for which pur-pose, as for drilling holes in china, it is peculiarly adapted, thelightness and evenness of its pressure lessening the danger ofcracking these brittle materials. One would think that thisquahty would make the pump-drill particularly unsuitable forfire-making; but, nevertheless, by making it very large andheavy, it has been turned to this service in North America, among the Iroquois Indians. Fig. 29 (drawn to a small scale) re-presents their apparatus, which is thus described by Mr. LewisH. Morgan :— This is an Indian invention, and of great anti-quity. ... It consisted of an upright shaft, about four feet inlength, and an inch in diameter, with a small wheel set upon 1 Wilkes, TJ. S. Exp., toI. v. p. 17. ^ Turner, p. 273. PIEEj COOKINGj AND VESSELS. 245. Fig. 29. the lower part^ to give it momentum. In a notcli at the top of the shaft was set a string-, attached to a bow about three feet in length. The lower point rested upon a block of dry woodj near which are placed small pieces of punk. When ready to use, the string is first coiled around the shaft, by turning it with the hand. The bow is then pulled downwards, thus uncoiling the string, and revolving the shaft towards the left. By the momentum given to the wheel, the string is again coiled up in a reverse manner, and the bow again drawn up. The bow is again pulled downwards, and the revolution of the shaft reversed, uncoiling the string, and recoiling it as before. This alternate revolution of the shaft is continued, until sparks are emitted from the point where it rests upon the piece of dry wood below. Sparks are produced in a few moments by the intensity of the friction, and ignite the punk, whic

Parole chiave associate all'immagine

• bookcentury1800
• bookdecade1860
• bookpublisherlondonjohnmurray