. Engineering and Contracting. t tlie stickshould be thawed completely, because dyna-mite when frozen can be detonated only withgreat difficulty and any part that is frozenwill be but imperfectly detonated in the hole;hence not only may such partly frozen pow-der fail to give its full effect as an explosive,but there is danger of a serious accidentwhere such powder is used. Where large quantities of explosives areused daily, a small thaw house should be pro-vided. Figures 1 and 2 illustrate a satisfac-tory thaw house and the Chicago specifica-tions for a contractors thaw house are givenin Engi
. Engineering and Contracting. t tlie stickshould be thawed completely, because dyna-mite when frozen can be detonated only withgreat difficulty and any part that is frozenwill be but imperfectly detonated in the hole;hence not only may such partly frozen pow-der fail to give its full effect as an explosive,but there is danger of a serious accidentwhere such powder is used. Where large quantities of explosives areused daily, a small thaw house should be pro-vided. Figures 1 and 2 illustrate a satisfac-tory thaw house and the Chicago specifica-tions for a contractors thaw house are givenin for Dec. 29,1909. All powder matnifacturers will furnishon application plans and specifications, to-gether with a bill of material, for a thawhouse which should be large enough to holdall the explosives used in one days work. Itshould be heated by a small hot water heater,placed at least -1 yards from the house, the hotwater being passed into the house throughiron pipes at such a rate that- the temperature. ^ i Ji^ \ \ i Id ?^77 777 62 —> \ 11 ^ m. 1 SECTION A-B
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