Machinery's Shop Receipts and Formulas
412 Shop Receipts and Formulas Selected From Machinery, Classified and Revised
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Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. I find the following means convenient for making a solution for marking white lines on blue-prints. I add to a small bottle of water enough washing soda to make a clear white line, then I add enough gum arabic to it to prevent spreading and mak ing ragged lines. To make red lines I dip the pen in red ink and then add a little of the solution by means of the quill.
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