Improvements introduced in the devices for parallel trailing and measuring distances between them (Machine-translation by Google Translate, not legally binding)

摘要

Improvements introduced in the devices to draw parallels and measure the distances between them according to which the drawing of the parallels is carried out using as a guide an arrangement of reciprocally parallel channels practiced on a plate-transparent millimetric template marked in one or more of the lines drawn the distances to be drawn by a second group of vertical parallels to the previous ones. (Machine-translation by Google Translate, not legally binding)