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| KNOCKING | When the amplitude of a balance wheel exceeds 315 degrees, the roller jewel may strike the horn of the pallet fork at the end of the supplementary arc. |
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| LIFT ANGLE | The angular distance which the roller jewel makes contact with the pallet fork. |
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| MEAN SOLAR DAY | The average, taken over one year of all the true solar days. |
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| MERIDIAN | An imaginary line on the earths surface passing North - South in relation to the polar axis. In 1884, the 0 meridian was fixed as a line passing North - South through Greenwich Observatory in England. |
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| NIVAROX | Self compensating balance spring alloy, basically nickel steel containing beryllium and other additions. |
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| OSCILLATION | Motion of balance from one position of maximum displacement to the next and the return to original position. |
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