Strength of cast iron and timber pillars: A series of tables showing the breaking weight of cast iron, dantzic oak, and red deal pillars

Wm. Bryson
1862 Journal of the Franklin Institute  
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)
more » ... f the finger-nail) is dropped upon the cut piece. The tiercury immediately spreads, penetrates the amalgam as far as the cut, and allows the piece to be removed, and put on the desired place. This manipulation is the most difficult part of the work. It is then gently pressed ou the spot with cotton; it soon hardens, and the glaarr looks as if it were new.-Coemoa.
doi:10.1016/0016-0032(62)90009-1 fatcat:rwuyhurbrjglnk3xlgmk5tbthu