On the Springing and Adjusting of Watches: Being a Description of the Balance Spring and the ... by Frederick James Britten

Author:Frederick James Britten
Language: eng
Format: epub
Publisher: Spon & Chamberlain
Published: 1898-03-25T05:00:00+00:00

Fig. 41. Fi ft . a.a.

1 horizontal partition 6 inches vfcm X\\e \>QV\»"m., -amSi. -*«£Qu

three legs to raise it from the floor. Inside is a cylindrical copper or zinc box as shown by the dotted lines, 9 inches in diameter and 9 inches deep with a rim to prevent it going too far down, and a hinged bezil with double panes of glass with an air space between them. A disc of wood is placed on the bottom to rest the watches upon. The oven is heated by a paraffin lamp, and there are a number of holes in the outer ring just below the partition as shown. Round the sides above the holes are several layers of flannel, with a loose cover of the same for the top.

There is one advantage of a square oven over the cylindrical shape, and that is the facility with which the thermometer can be seen through the glazed door, but many good timers use a round one substantially as described, which is cheaper to construct.

Gas Governor. —Fig. 43 is Mr. Kullberg's effective and ingenious attachment to an oven heated by gas. The gas enters by the right-hand pipe into the glass tube, and from there through a hole in the left-hand pipe to the burner that heats the oven. It will be observed that the left-hand pipe is prolonged to nearly the bottom of the glass tube to furnish an attachment for a laminated arm. This arm, made of a thick piece of mainspring and rather thicker brass outside, carries at its free end a weight, and just beyond a conical tit that acts as a stopper for the hole in the exit pipe. A nick is made in this hole to allow of the passage of sufficient gas to keep the burner just alight even when the stopper is pressed home. As the temperature rises the bending of the laminated arm causes the tit to approach the hole, and the reverse action takes place with a fall of temperature. By tilting the instrument to the right or left the weight retards or assists the action of the laminated arm, so that any adjustment needed maybe made. A screw with a large head nips the two pipes when the proper inclination has been obtained. There are also a pointer and circular scale for denoting the angle of inclination. The two pipes are of brass, but they may have flexible +ube connections to the gas supply and burner respectively,

to allow of the tilting of the governor, the lower part of which is, of course, immersed in the oven.

Fig. 44 is another form of a regulator, consisting of a glass tube with a reservoir of mercury (c) at the bottom. A hollow tapered glass plug is ground into the top of the tube. The gas enters this plug at A, and passes out of the bottom of the plug into the tube, and through B to the burner. The volume of gas allowed to pass depends | upon the distance between the bottom ' of the plug and the top of the mercurial column.

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