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Locomotion
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Locomotion
National Railway Museum
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Image
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8
Non-Commercial Use
8
Category
Time Measurement
8
Maker
Mercer, Thomas
8
Thomas Mercer
8
Object type
compensation balance for chronometer
8
Place
St Helens
1
St Helens, England, United Kingdom
1
Material
brass (copper, zinc alloy)
3
steel (metal)
3
arms: bi-metallic
2
balance-spring (for use with): steel
2
bi-metallic
2
affixes and blades: bi-metallic
1
balance: 'invar' (iron, nickel and carbon)
1
metal (unknown)
1
nickel-steel alloy
1
palladium
1
Date
From
To
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Uncut brass balance with bi-metallic affixes
Uncut Invar balance with bi-metallic affixes
Compensation balance with Kullberg's auxiliary
Guillaume compensation balance
Compensation balance (modified Earnshaw type)
Compensation balance, with Poole's auxiliary
Compensation balance
1850-1900
Compensation balance with Mercer's auxiliary
