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Question
To keep the correct time modern day watches are fitted with balance wheel made of:
To keep the correct time modern day watches are fitted with balance wheel made of:
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Solution
The correct option is C Invar
The balanced wheel is a weighted wheel that rotates back and forth, being returned toward its center position by a spiral torsion spring. It is used to keep time. A major source of accuracy is the temperature. The dimension of the balance spring used to increase due to thermal expansion. Invar is a nickel steel alloy with very low thermal expansion. Elinvar is an alloy whose elasticity is unchanged over a wide temperature range, for balance springs. A solid Invar balance with a spring of Elinvar remains largely unaffected by temperature. This leads to an accurate correction of the temperature.
The balanced wheel is a weighted wheel that rotates back and forth, being returned toward its center position by a spiral torsion spring. It is used to keep time. A major source of accuracy is the temperature. The dimension of the balance spring used to increase due to thermal expansion. Invar is a nickel steel alloy with very low thermal expansion.
Elinvar is an alloy whose elasticity is unchanged over a wide temperature range, for balance springs.
A solid Invar balance with a spring of Elinvar remains largely unaffected by temperature. This leads to an accurate correction of the temperature.
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