Canadian Jewellers Association · Toronto : Maclean-Hunter Pub. Co · leaf 537
eriod andeliminating tin- effect of tune upon the rates. After the second period at 45 is ended the chronometers are removed to the elnonoineter room where they are subjee tedto the natural conditions of the atmosphere as to temperature and humidity. They are here compared daily for twelve weeks .a… … DOIN BoMltRt, T Df? sTe-WlLry -*= yy<y>
Jewelry · Jewelry trade
Internet Archive · Thomas Fisher Rare Book Library · Public Domain Mark 1.0. Free to use for anything.
