Gjers did this by setting the partlysolidified ingot in a well-closed " pit " of brickwork, preheated by the excess heat of previous lots of ingots. [Please select]
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_--The whole piece should be preheated and kept well covered while welding. [Please select]
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If too rapid it does not become sufficiently preheated in the glass spiral, and if too slow there is a more rapid decomposition of the nitro-cellulose by the oxides of nitrogen which are not removed. [Please select]
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The melting point of the work which is being preheated should be kept in mind and care exercised not to approach it too closely. [Please select]
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