English: Centralograph, own invention by engineer Gábor Kornél Tolnai (1902-1982), Budapest, in 1928-1931. This picture shows Tolnai-Teletachograph with diagram paper (chart paper). At the set-up of the centralograph the machine is in connection with a wiring test terminal box. The teletachograph has a pencil, which draws the diagram, with the holder for the pink. On the chart of the teletachograph one can read the downtime of the machine for the shift (the shift of the spool), how slow and how quickly the machine restarts and how long the first, lower speed lasted at startup. Even spindle speed can be read, the white part represents the actual work chart. Unevenness in velocity should not be considered. The machine's spindle speed can be 7,000 turns, but sometimes it is reduced to 6,000 turns, apart from the starting torques.