G. Gerlach coordinatograph

The coordinatograph is a device for plotting points with specific coordinates on maps by punching holes in the map. The presented coordinatograph is based on the Cartesian coordinate system and it is used for plotting points with specific ordinate (y) and abscissa (x) coordinates. The point of punching is indicated thanks to the presence of two perpendicular rulers with scales and moving carriages. One of the rulers is fixed and is used for reading out the ordinate, and the other, mounted on a moving carriage, allows reading out the abscissae and mark them with a needle mounted on another carriage moving along the ruler. Instruments from the G. Gerlach factory were considered to be on par in terms of quality with products of the most renowned German manufacturers, such as Zeiss. Manufacturer: Specjalna Fabryka Instrumentów Geodezyjnych i Rysunkowych G. Gerlach, 1920s – 1930s Inv. No.: MIM1291/XI-61 Model prepared on the basis of photogrammetric measurements. Licence: CC BY-NC-SA