Jewel Pin Setter
Fig 188 illustrates the Logan patent. It is an excellent tool and will save the workman considerable time and much annoyance by its use. Every watchmaker is aware what a difficult and tedious matter it is to set a jewel pin correctly. With this tool the job is accomplished quickly and accurately.
JODIN, JEAN. A clever French watchmaker of the eighteenth century. Author of a work on horology. He was the first to point out that success in the timing of horizontal watches depends on the correct proportioning of all their parts.