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Accurate Clock Pendulums$
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Robert J. Matthys

Print publication date: 2004

Print ISBN-13: 9780198529712

Published to Oxford Scholarship Online: January 2010

DOI: 10.1093/acprof:oso/9780198529712.001.0001

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Barometric compensation with a crossed spring suspension?

Barometric compensation with a crossed spring suspension?

(p.127) Chapter 17 Barometric compensation with a crossed spring suspension?
Accurate Clock Pendulums

Robert James Matthys

Oxford University Press

A crossed spring suspension provides an axis of rotation characterised by extremely low friction, something that a pendulum can use. The suspension typically consists of four flat strips of spring metal (two sets of two, with the two sets oriented at 90 degrees to each other) that are clamped at the ends. For small rotation angles, the axis of rotation is nominally located at the springs' crossover point in the middle of the springs. The suspension has three important characteristics. First, it has extremely low friction. Second, the rotational stiffness of the suspension springs (in units of torque per unit angle about the axis of rotation) varies with the total weight suspended from the springs, that is, with the weight of the pendulum. Third, the axis of rotation moves horizontally as the pendulum swings away from its vertical orientation in the center of swing. This chapter proposes an idea for barometric compensation of a pendulum using a crossed spring suspension.

Keywords:   barometric compensation, crossed spring suspension, axis of rotation, pendulum, friction, rotational stiffness, weight, swing

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