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General Roy's standard scale by Jonathan Sisson, 1742

General Roy's standard scale by Jonathan Sisson, 1742

1742
Tower of London Standard Yard Rod

Tower of London Standard Yard Rod

1659
Bronze mural tablet with standard measures, bolts for fixing, giving end measures, one yard, one foot, six inches and a 36 inch scale. 60 degree F verified at the Standards Department

Bronze mural tablet with standard measures

1893
Bronze mural tablet with standard measures, bolts for fixing, giving end measures, one metre, 1 decimeter, 50 Centimeters, and a 100 cm, scale correct ao 62 degree F verified at Standards Department

Bronze mural tablet with standard measures

1893