File:The dictionary of arts, sciences and manufactures embracing in all nearly three thousand articles on arts and sciences (1859) (14580971968).jpg

Identifier: dictionaryofarts02smit (find matches)
Title: The dictionary of arts, sciences and manufactures ... embracing in all nearly three thousand articles on arts and sciences
Year: 1859 (1850s)
Authors: Smith, James, author of the Panorama of science and art
Subjects: Technology Industrial arts
Publisher: Boston, Phillips, Sampson, and Co.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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e bottom BB, and securedto the upper part of the pole at E. The curved planks CC are also strengthened and supportedby the short braces FF, GG, and HH, which extend from thestays II to the curves CC ; these form a strong and securescaffold, which may be easily moved round to any part of theinternal dome at pleasure. To strengthen the frame sideways,diagonal braces are applied.between the two uprights KK. This scaffold is the invention of G. Hughes, a respectablepainter and plasterer of Manchester. It was used for repair-ing and beautifying the Exchange in that town, and the expense of its erection did not exceed £4; the estimate for r*scaffold on the common plan, for the like purpose, would havebeen £40 or £50. The inventor was rewarded by the Societyfor the Encouragement of Arts, &c. with a silver medal. In cases where the elevation of the dome is very consider-able, a great degree of security might be obtained, by the ad-dition of a railino- to the scaffold. M lscellaxvu.-s ,
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Xpipry, scuip. MISCELLANIES. 817 Blasting wood.—Printing from plants. Method of breaking up Logs of Wood. The large roots of trees, and other logs of wood, are fn -quently suffered to accumulate in farm-yards and other place?,because, though they would supply a large quantity of firewood, the trouble of working them up with the saw or the axe,would not be compensated by their value. Knight, of Foster-lane, London, therefore introduced a method, which has beensuccessfully practised, of blasting such logs of wood with gun-powder. He bores with an auger, the wood intended to bebroken up, then puts a charge of powder into the hole, whichhe closes by screwing into it a screw of a proper size. Thescrew, having been prepared for the purpose, has a hole madethrough its axis; this hole is filled by a wire when the screwis put into the hole, but the wire is drawn out afterwards, anda match, made of a piece of twine, dipped in a solution ornitre, is put in its place. This match being set fire

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