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On the Strength of Iron and flmber Pinare. 18s uncovered and cleaned by gentle rubbing with fine cotton until there is no trace of dust or grease. This cleansing must be done with the greatest care, if we would not leave a stain around the place. Then, with the point of a knife, a piece is cut from the silvering of another glass, of the same shape with that removed, but rather larger. 8: small globule of mercury (for instance, the size of a pin's head for a surface the size of the finger-nail)doi:10.1016/0016-0032(62)90009-1 fatcat:rwuyhurbrjglnk3xlgmk5tbthu