Standards

A one inch standard by W. & T. Avery of Birmingham.
Figure 1: A one inch standard by W. & T. Avery of Birmingham.
In the old days all geodetic networks started at a base and had at least another base to compare the first one to. These bases were laid out using accurate distance measuring tools as can be found in the Tools section.

In order to verify the chains, tapes and rods used in the field standard lengths were required to compare them to. The national standards were kept in the Parliament buildings, while for convenience local copies were distributed around the country.

In the collection are three local standards that once belonged to Lincolnshire, West Yorkshire and Northumberland: an Inch, a Yard and a Chain.



If you have any questions and/or remarks please let me know.

1875 W&T Avery Ltd. Yard
Figure 2: 1875 W&T Avery Ltd. Yard
 
19th c. Doyle and Son Chain
Figure 3: 19th c. Doyle and Son Chain

20th century Breithaupt PRURO circle testing collimator.
Figure 4: 20th century Breithaupt PRURO circle testing collimator.
   

Surveyor's crosses Geodetic Sextants Theodolites Total Stations Levels Standards Tools Firms
19th c. W&T Avery Ltd. Inch 1875 W&T Avery Ltd. Yard 19th c. Doyle and Son Chain Breithaupt PRURO