At Fig. 40 we show the balance cock of our model with modified form of Howard regulator.  The regulator bar A and spring B should be ground smooth on one side and deeply outlined to perfect form.  The regulator cap C is cut out to the correct size.  These parts are of decarbonized cast steel, annealed until almost as soft as sheet brass.  It is not so much work to finish these parts as one might imagine.  Let us take the regulator bar for an example and carry it through the process of making.  The strip of soft sheet steel on which the regulator bar is outlined is represented by the dotted outline b, Fig. 41.

[Illustration:  Fig. 41]

To cut out sheet steel rapidly we take a piece of smooth clock mainspring about 3/4” and 10” long and double it together, softening the bending point with the lamp until the piece of mainspring assumes the form shown at Fig. 42, where c represents the piece of spring and H H the bench-vise jaws.  The piece of soft steel is placed between the limbs of c c’ of the old mainspring up to the line a, Fig. 41, and clamped in the vise jaws.  The superfluous steel is cut away with a sharp and rather thin cold chisel.

[Illustration:  Fig. 42]

The chisel is presented as shown at G, Fig. 43 (which is an end view of the vise jaws H H and regulator bar), and held to cut obliquely and with a sort of shearing action, as illustrated in Fig. 42, where A’’ represents the soft steel and G the cold chisel.  We might add that Fig. 42 is a view of Fig. 43 seen in the direction of the arrow f.  It is well to cut in from the edge b on the line d, Fig. 41, with a saw, in order to readily break out the surplus steel and not bend the regulator bar.  By setting the pieces of steel obliquely in the vise, or so the line e comes even with the vise jaws, we can cut to more nearly conform to the circular loop A’’ of the regulator A.

[Illustration:  Fig. 43]

The smooth steel surface of the bent mainspring c prevents the vise jaws from marking the soft steel of the regulator bar.  A person who has not tried this method of cutting out soft steel would not believe with what facility pieces can be shaped.  Any workman who has a universal face plate to his lathe can turn out the center of the regulator bar to receive the disk C, and also turn out the center of the regulator spring B.  What we have said about the regulator bar applies also to the regulator spring B.  This spring is attached to the cock D by means of two small screws at n.

The micrometer screw F is tapped through B’’ as in the ordinary Howard regulator, and the screw should be about No. 6 of a Swiss screw-plate.  The wire from which such screw is made should be 1/10” in diameter.  The steel cap C is fitted like the finer forms of Swiss watches.  The hairspring stud E is of steel, shaped as shown, and comes outlined with the other parts.