Saturday, September 24, 2005

Daniels' Coaxial and Flat Coaxial Compared

George Daniels' original patent application:

And as embodied in his early pocket watches:

uses two escape wheels fixed to an arbor (co-axial), with a standard pinion, as opposed to the later "extra flat" version:

that is found in later Daniels' watches and as adopted by Omega. This "extra flat" version uses an extra wheel in the going train that engages a multi-purpose pinion/impulse wheel which sits co-axially on an arbor with the other escape wheel.

In the above figure:
The escapement is composed of an intermediary wheel A, a double Coaxial wheel B composed of escapement pinion C and escapement wheel D, pallet fork E with 3 ruby pallet-stones F, G,H and a balance roller K carrying a ruby impulse stone J and a ruby impulse pin L. The roller is fitted to the sprung balance. In the Coaxial escapement, the clockwise impulse is delivered to the oscillator directly by the escape wheel engaging the balance roller. The anti-clockwise impulse is delivered to the balance roller via the lever. After each impulse, the escape wheel is locked stationary by the lever locking pallets allowing the balance to complete its vibration undisturbed.

However, Roger Smith is now making watches to the original design. Take a look here.

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