Part 7 (1/2)

Carefully turn back the banking on one side so the jewel pin will just pass out of the slot in the fork Repeat this process with the opposite banking; the jewel pin will now pass out on each side Be sure the guard pin does not interfere with the fork action in any way The fork is now in position to conform to the conditions required

HOW TO ADJUST THE PALLETS TO MATCH THE FORK

If the escaperees lock and escape correctly; but in the instance we are considering, the stone will not permit the teeth to pass, and must be pushed in until they will It is not a very difficult ether so we can see exactly how e how far to push it back e have it out and heated There is still an ”if” in the proble, which lies in the fact that the fork we are experie it for ten degrees of angular e experience will be able to judge of very closely, but the better plan for the workular movement of the fork Of course it will be understood that with a fork which engages the roller for eight degrees of fork action, such fork will not give good results with pallets ground for ten degrees of pallet action; still, in ive results that will satisfy the owner of a watch of moderate cost, and from a financial point of view it stands the repairer in hand to do no more work than is absolutely necessary to keep him well pleased

We have just ular motion of the lever Before we take up this matter, however, ill devote a little time and attention to the subject of jewel pins and how to set them We have heretofore only considered jewel pins of one form, that is, a round jewel pin with two-fifths cut away We assumed this form from the fact that experience has demonstrated that it is the most practicable and efficient form so far devised or applied Subsequently we shall take up the subject of jewel pins of different shapes

HOW TO SET A JEWEL PIN AS IT SHOULD BE

Many work a jewel pin and seem to fancy that theythis end Most American watches have the hole for the jewel pin ”a world too wide” for it, and we have heard repeated coinal object of this acco sort of hole was to favor or obviate faults of pallet action Let us suppose, for illustration, that we have a roller with the usual style of hole for a jewel pin which will take al needle up to a round French clock pallet

[Illustration: Fig 65]

We are restricted as regards the proper size of jewel pin by the width of the slot in the fork Selecting a jehich just fits the fork, we can set it as regards its relation to the staff so it will cause the pitch circle of the jewel pin to coincide with either of dotted circles _a_ or _a'_, Fig 65 This will perhaps be better understood by referring to Fig 66, which is a view of Fig 65 seen in the direction of the arrow _c_ Here we see the roller jewel at _D_, and if we bring it forward as far as the hole in the roller will permit, it will occupy the position indicated at the dotted lines; and if we set it in (toward the staff) as far as the hole will allow, it will occupy the position indicated by the full outline

[Illustration: Fig 66]

Now such other conditionthe jewel pin forward to the position indicated by the dotted lines at _D_, Fig 66, would re 64 without any other change being necessary We do not assert, understand, that a hole too large for the jewel pin is either necessary or desirable--ish to convey to the reader is the necessary knowledge so that he can profit by such a state if necessary A hole which just fits the jewel pin so the merest film of cement will hold it in place is the way it should be; but we think it will be some time before such rollers are made, inasmuch as economy appears to be a chief consideration

ABOUT JEWEL-PIN SETTERS

To ht is easy enough, but to devise any such instrument which will set a jewel so as to perfectly accord with the fork action is probably not practicable

What the workman needs is to know from examination when the jewel pin is in the proper position to perform its functions correctly, and he can only arrive at this knowledge by careful study and thought on thea watch that a jewel pin is ”set too wide,” that is, so it carries the fork over too far and increases the lock to an undue degree, take out the balance, re, warm the roller with a small alcohol lamp, and then with the tweezers move the jewel pin in toward the staff

[Illustration: Fig 67]

[Illustration: Fig 68]

[Illustration: Fig 69]

[Illustration: Fig 70]

No attempt should be made to move a jewel pin unless the cement which holds the jewel is soft, so that when the parts cool off the jewel is as rigid as ever A very little practice will enable any workman who has the necessary delicacy of touch requisite to ever becoood watchmaker, to manipulate a jewel pin to his entire satisfaction with no other setter than a pair of tweezers and his eye, with a proper knowledge of what he wants to acco up the jewel pin, leave it on the staff, and after re hold the balance by the ri it” back and forth through the flame of a rather small alcohol lamp until the rim of the balance is so hot it can just be held between the thuer, and while at this temperature the jewel pin can be pressed forward or backward, as illustrated in Fig 66, and then a touch or till set the pin straight or parallel with the staff Figs 68 and 69 are self-explanatory For ces 67 and 70 It is made of a piece of copper wire about 1/16” in dia 67

The ends _b b_ of the copper wire are flattened a little and recessed on their inner faces, as shown in Fig 70, to grasp the edges of the roller _A_ The heat of an alcohol la_ until the small bit of shellac placed in the hole _h_ melts The necessary suum into a filament the size of horse hair A bit of this broken off and placed in the hole _h_ supplies the ces 68 and 69 will, no doubt, assist in a clear understanding of the matter

HOW TO MAKE AN ANGLE-MEASURING DEVICE

We will now resu the extent of the angular motion of the fork and pallets Now, before we take this matter up in detail ish to say, or rather repeat e have said before, which is to the effect that ten degrees of fork and lever action is not iet just as sound an action and precisely as good results with nine and a half or even nine degrees as with ten, if other acting parts are in unison with such an arc of angulardevice is to aid in co the relative action of the several parts with a known standard

[Illustration: Fig 71]

For use with full-plateclip or clasp to e