A Rudimentary Treatise on Clocks, Watches & Bells for Public Purposes by Edmund Beckett Grimthorpe Edmund Beckett

Author:Edmund Beckett Grimthorpe, Edmund Beckett
Language: eng
Format: epub
Publisher: Lockwood
Published: 1903-03-25T05:00:00+00:00

weathercocks which work a wind-dial inside the house, and the ease with which a very heavy weight can he tnmed in that way is surprising.

Weathercocks. —^As these are generally fixed hy clock-makers in such cases as those last mentioned, I may as well mention that a weathercock which is intended to answer steadily to the wind, ought not only to he long in the vane and thin in the tail, hut equipoised; and so far from the vane heing perforated for ornament, it should he douhle, with the two flat sides or vanes spreading out at a small angle from the axis. When the cock works a dial it must he fixed to a rod working loosely in a tuhe, and the top of the tuhe covered with an inverted fannel on the rod ; as also the rods or wires which work the clock-hammers should he funnelled, over a short pipe soldered to the leads, wherever they are exposed to rain: otherwise the wires lead down the wet into the clock. And the weights and ropes should be enclosed in a case to keep them from the rain and wind, if they are in an exposed place. (See also p. 395.)

Ventilation of clock-room. —The clock-room at the Exchange was at first made with the object of keeping out the dust and damp in every possible way : even the sHts in the floor for the ropes had sliders to them; the clock was enclosed in a glass case, the plate-glass cover originally placed over the escapement being found not enough to keep it from the damp. When the clock was repaired, and some of the brass-work replaced with iron in 1854 (for a reason which I shall mention hereafter), I suggested the removal of all this glass, and encouraging instead of preventing a draught through the room. This was done ; and although the wet used to stand in drops upon the clock before in damp weather, it has been perfectly dry-ever since. The same thing has been found in small clock-cases: they may easily be too airtight. I do not mean that there is any objection to enclos-mg a clock in a case, and of course it is absolutely necessary

a 28 TBAIN BEM0NT0IBE8.

where the dock-room cannot be kept locked against everybody but the man who has the care of it; only there should be a draught through the room, and the case itself not too close to let air through it. If the room can be kept warm enough to prevent the damp from condensing on the clock it is better still.

TRAIN REMONTOIRES.

I have postponed this branch of the subject till I had gone through all the more ordinary work of turret clocks. A train remontoire differs in principle from a remontoire escapement (of which I have already treated) only to this extent: the small weight or spring which gives the impulse to the pendulum is not wound up at every beat, but at some longer intervals, seldom

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