A lignes ruler is a type of measuring tool used in horology, the study and measurement of timekeeping devices, such as watches and clocks. It is used to measure the size and spacing of various components in these devices, such as the gears, wheels, and jewels.
The lignes ruler is named after the lignes system of measurement, which was developed in France in the 18th century and is still used in horology today. One ligne is equal to 2.2558 millimeters, and the Lance lignes ruler features markings in both lignes and millimeters.
Lance lignes rulers are made of plastic, and have markings along their length indicating measurements in lignes and millimeters.
To use a lignes ruler, you would place the ruler along the component you want to measure, and align the starting point with one end of the component. Then, you would read the measurement from the markings along the ruler.
Overall, lignes rulers are a specialized tool for horology that are used to measure the size and spacing of various components in timekeeping devices. They are easy to use, accurate, and essential for anyone working in the field of horology.
