The sloping sides of the conical bottom can be freed from the coating of scum which forms upon them every two or three hours by two rotatory scrapers, formed of L-irons, which can be slowly turned by an attendant by means of a central shaft provided with a suitable handle. [Please select]
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While they were working away with their iron scrapers, suddenly they saw fire bursting out through her ports. [Please select]
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Three of the older squaws went to work with bone scrapers to tan the hide. [Please select]
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] The trenching was done by wheel scrapers to the amount of waste. [Please select]
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The scrapers spread and bring pressure to bear on all sizes. [Please select]
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The side scrapers must be made of metal that will spring. [Please select]
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Soot may be removed by the daily use of blowers, scrapers, and cleaners. [Please select]
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