A Discussion On the Making of Reflecting Surfaces Held On 26th November 1920

Cover A Discussion On the Making of Reflecting Surfaces Held On 26th November 1920
A Discussion On the Making of Reflecting Surfaces Held On 26th November 1920
Physical Society Great Britain
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" By ROBERT S. WHIFFLE, M. I. E. E.
(The Cambridge and Paul Instrument Co. , Ltd. ) Although the silvering of glass or quartz fibres is not intended for the production of reflecting surfaces, yet the technique of doing so may be of interest.
In the Einthoven string galvanometer a silvered glass or quartz fibre is stretched in a strong magnetic field, the silvered fibre acting as a conductor and forming the moving system of the instrument. * It is important that a hard and homogeneous film of si
...lver should be deposited, as the resistance of the fibre should remain as far as possible constant ; and that connecting wires should be soldered to the silver. In practice it has been found that a more homogeneous film of silver can be deposited on a glass than on a quartz fibre, and for this reason the glass fibre is frequently used in preference to the quartz one. The fibres, which are about 7-5 cm. Long and from 0-0015 to 003 mm. In diameter, are produced by the method described by Souttar. F In this method the fibres are drawn by means of a falling weight from a glass rod or tube of small diameter heated in a small electric furnace.

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