In the construction of this soft-iron instrument it is essential that the fragment of iron should be as small and as well annealed as possible and not touched with tools after annealing; also it should be preferably not too elongated in shape so that it may not acquire permanent magnetization but that its magnetic condition may follow the changes of the current in the coil. [Please select]
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When annealed, bore out the inside to 1-11/16 in. [Please select]
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A small thick-walled bulb is now blown as indicated by the dotted lines, and annealed. [Please select]
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A small thick-walled bulb is blown at the point indicated by the dotted lines, and annealed. [Please select]
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The joint is then well annealed and allowed to cool. [Please select]
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The whole circumference of the tube is then heated and annealed carefully. [Please select]
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The whole circumference of the tube is heated at that point and annealed as usual. [Please select]
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