misterpexies57
Crown calibration stamp
We recovered this calibration stamp and brass retainer from the old body.
Many years ago weighbridges were quite rare and bulk loads especially low value loads such as sand and gravel was measured in cubic yards instead of weight.
A steel calibration stick was bolted inside the body to gauge level loads in cubic yards. This meant the load had to be reasonably level to get an accurate capacity reading.
The body capacity was usually marked on the outside for reference purposes.
In order to haul bulk loads using this system, the calibration stick had to be fixed in the correct position and bolted in place by the equivalent of trading standards of the day.
The bottom bolt was a tamper proof head inside the body with the nut tightened up inside the brass boss on the outside which you can see.
Trading standards then pressed in a lead seal to cover the nut and stamped it with the crown and stamp date.
This prevented any unscrupulous operator moving the calibration bar up or down. You would have to destroy the seal to undo the nut and if caught, resulted in prosecution.
We have the calibration bar and it is being shotblasted at the moment. Once cleaned up and painted, I will bolt it inside the body. The date is very relevant as it is the year I was born!
Crown calibration stamp
We recovered this calibration stamp and brass retainer from the old body.
Many years ago weighbridges were quite rare and bulk loads especially low value loads such as sand and gravel was measured in cubic yards instead of weight.
A steel calibration stick was bolted inside the body to gauge level loads in cubic yards. This meant the load had to be reasonably level to get an accurate capacity reading.
The body capacity was usually marked on the outside for reference purposes.
In order to haul bulk loads using this system, the calibration stick had to be fixed in the correct position and bolted in place by the equivalent of trading standards of the day.
The bottom bolt was a tamper proof head inside the body with the nut tightened up inside the brass boss on the outside which you can see.
Trading standards then pressed in a lead seal to cover the nut and stamped it with the crown and stamp date.
This prevented any unscrupulous operator moving the calibration bar up or down. You would have to destroy the seal to undo the nut and if caught, resulted in prosecution.
We have the calibration bar and it is being shotblasted at the moment. Once cleaned up and painted, I will bolt it inside the body. The date is very relevant as it is the year I was born!