Calibration mark
Verification marks are used as part of the recurring inspection of scales , weights and units of measurement in order to document the successful completion of verification . While these are more sober sticky notes with abstract symbols today, very different symbols such as letters, numbers or graphics were used in the past to directly document the calibration process on the piece to be checked.
On metal objects (weights, scales) this was mostly done with stamps, on wood (dimensions) also with brand stamps. The calibration was partly carried out directly on the weight piece or measure itself, or on an additionally attached plug or the like. made of lead or copper.
Calibrations or comparable checks were carried out every six months ( Portugal ), mostly annually, or every two years ( Italy , Austria ).
Historical calibration marks from the calibration ordinance of 1885 (Germany)
General stamp
Stamp marks for precision dimensions, measuring tools, weights and scales
Stamp marks for gold coin weights
Stamp of the Imperial Standard Calibration Commission
Stamp of the calibration supervisory authorities
Stamp of the calibration authorities
Web links
- gesetze-im-internet.de/messev - MessEV Annex 8, identification