Bras self-indicating letter balance, 1863
4 0 c m
 
33cm
actual image size: 25cm x 32cm

Bras self-indicating letter balance, 1863

© Science Museum / Science & Society Picture Library

Description

Hall's patent letter balance made by Parnell, London. The balance, used for weighing letters to calculate the cost of postage, indicates from 0 to 4 ounces.
 

Image Ref.

10319641
 

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