Logan Journal | 1891-02-07 | Page 2 | How to Harden Case Springs

low how to iwarden cit springs la in order to liardet n ca cao c and other pressure springs jewelers review says that they should first bo be heated then rubbe I 1 over with boap next heated to a cherry rod red not a white because too the steel would burn dipped quickly into petroleum and annealed light blue in place of oil rub them over with tallow let it smoke off and cool on the annealing sliest file tempering and smoking oft off are best d done one outside tle workshop as a bad smell is created thereby