Mannering. which can be readily procured either in fluid form or powderat a drug store. The tender flesh is dried and tanned by this application and ceases to be painful. When this hardened flesh has remained on two or three weeks it can be easily removed by soaking in warm water. Further trouble can only be prevented by cutting d finger marks? A. Mix quicklime with strong lye so as to form a mixture having the consistency of cream and apply it immediately with a brush. If this compo sition be allowed to remain for a day or tw and be then washed off with soap and water the marble will appear as though it were new. (20) J. T. Wt. asks why it is that the secondary coil of an induction coil is always composed of very fine wire and will not coarser wire do equally well? A. By using fine wire in the secondary of an induction coil more convolutions are obtained for the same volume with consequent increased tension. Large wire would make the coil too bulky; small wire is used as a matter of convenience and also to keep the sec ondary well within the influence of the primary. (21) C. N.-Your greatest trouble pro chisels in forging. The corners should be no hotter at any time than the center. A slow fire or low blast is always necessary to the successful forging of steel-cut ting tools. For various instructions in tempering see (22) T. W. M. Co.-If you wish to make a chilled surface against a cold iron mould use simply to make hard castings in sand moulds use No. (23) V. S. M. asks for the best lubri cant for central fire rifle cartridges. I have used tallow and wax and mutton tallow alone and in cold weather they:scale off badly. A. Try paraffine or vaseline. (24) J. A. R. writes : I have in my house brass door knobs. When they were purchased we were told that they would not tarnish but they d I now want to tarn them black without waiting the slow process of time. How can I do it? A. Thoroughly cleans the varnish from the knobs With alcohol and scrub with a brush and soluti
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