Hood, Grant · Kansas City, Mo. : Kansas City Jeweler and Optician · leaf 66
thisimportant part, as has already been, demonstrated in theprevious article on Iron and Steel. That which has beenoverheated in hardening will be very brittle and unfit for 62 THE BALANCE STAFF AND ITS MEASUREMENTS. our work; only that hardened at a very low temperature,barely a cherry red, will… … Fig. 6. beeswax or a little lard oil and heat over a lamp until thebeeswax or oil ignites. This will make a hard staff; if youallow it to burn off, it will make a softer staff, one that willturn easily. It is a mistake, making a staff too hard, as itwears no better, and is more liable to break.…
Clocks and watches
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