The punch having returned to its first position, the cutters c, c, and the dies E, E, are now raised, and the wires a, and b, advance one length, as before ;-the cutters and dies then approach, the punch advances, the head is formed, and the pin finished as above described.

A second machine is described, for delivering two pins at each revolution of the main axis, which differs from the first, only, in having two sets of the machinery.

The patentee claims the combination of various parts or pieces of mechanism, constituting the two self-acting machines, for making or manufacturing pins, with heads formed of curls of fine wire, applied round the strong wire, whereof the stems are formed.

The minor or subordinate combination of parts, for curling the end of the fine wire around the end of the strong wire, before either of those wires are cut into the portions requisite for forming distinct pins.

The minor or subordinate combination of parts, for disposing and holding fast the ends of the wires, so that they cross each other, between the edges of the cutting blades, in proper relative positions for undergoing the curling, which is to be performed by the aforesaid second minor combination. And after the curling has been performed, the said parts, for so holding the wires then cut off from the end of the fine wire, so much thereof as has been curled, and likewise by the same cutting action, cut off so much from the end of the strong wire, as is sufficient to form the stem of one pin, leaving the said curls of small wire on that extremity of the strong wire, from which the aforesaid portion thereof has just been detached; the said curls being ready to be pushed forwards, with the strong wire, when the same is again advanced.

Lastly, the particular kind of revolving grinder, for forming the points of the pins, which has two grinding surfaces,

forming an angular groove around the circular grinder, both of which grinding surfaces cut the end of the stem at the same time, but with different degrees of tapering; one of the said grinding surfaces forming a tapering end to the stem, and the other grinding a pricking point thereto.[Inrolled in the Rolls Chapel Office, December, 1833.]

The Specification of this invention, does not very clearly set out the details of this machine, but it may be fully understood by reference to the Patent of L. W. Wright, for making pins, granted in 1824, (see Vol. IX. of our First Series,) the leading features of which are the same as those above described, excepting that in Wright's machine, solid heads are formed on the pins, by crushing the ends of shafts in the dies; whilst in the latter invention, the heads are produced by coiled wire, spun on (as it is commonly termed). We believe that the resemblance between the two is so evident, that it has not been thought advisable to carry the latter invention into operation.-ED.

TO CHARLES CHUBB, of St. Paul's Church-yard, in the city of London, patent detector lock manufacturer, and EBENEZER HUNTER, of Wolverhampton, in the county of Stafford, locksmith, for their invention of certain improvements in locks, and for fastening and security. -[Sealed 20th December, 1833.]

THIS invention consists of improvements on the detector lock, for which a previous patent had been granted,—the first to Jeremiah Chubb, dated 1818,-and secondly, to Charles Chubb, dated 1824.-See Vol IX. of our First Series, page 416.

Part of these improvements apply to the simplification of the internal parts of the detector lock, by the application of a simple kind of detector. This detector is a small bar, suspended by one end, the other end being formed into a hook, at the back of which is a small spur. The tumblers (which are either four or five) are circular plates, having a variety of different passages, through which a stud, attached to the bolt of the lock, passes. These passages are made to correspond with each other, by means of different projections on the bit of the key, which projections raise the tumblers to different heights. All these passages must correspond, and have a free entrance for the stud on the bolt, before the lower projection on the bit of the key can draw back the bolt.

In order to apply the detector, a small notch is cut in the edge of any one of the tumblers, so that on a pick-lock or false key being introduced, or any attempt made to open the lock, the tumblers are raised, and the hook of the detector catching into the notch in the edge of that one tumbler, detains it in its raised position.

When the lock is in this state, it cannot be unlocked even by the true key; an extra notch is therefore cut in the under part of the bolt, by turning the key into which, the bolt is overshot. During the over-shooting of the bolt, a nib or stud attached to it, comes in contact with the spur of the detector, and draws it back from the tumbler, which being now released, is brought to its proper position, by means of its spring. The tumblers being placed all in their proper positions, the lock can be unlocked.

The tumblers may likewise be caused so to act, that on a pick-lock or false key raising any of them, the tumbler so raised, will raise the one that is acted on by the detector. This is effected by attaching a small bar to the detecting tumbler, which bar is received in notches cut in

the other tumblers, so as not to offer any obstacle to the ordinary mode of working; but when any of the other tumblers are raised, they raise the detecting tumbler by means of the bar.

Another part of these improvements applies to doublelocking this detector lock, by means of an additional key. The passages in the tumblers are made rather different to those above mentioned, and there is an additional notch cut in the under part of the bolt; but the remainder of the works are the same. The lock is first locked by the ordinary key, and then by the additional one, which turns into the other notch; the tumblers are thus raised to a different position by the second key, for the purpose of allowing the stud on the bolt to pass into the outermost passages.

In order to unlock the bolt, it must first be acted upon by the second key, and then by the first, it being impossible to unlock it with one key only, after the bolt has been double-locked, as the projections on the bits of the keys are essentially different.

When this improvement is applied to a lock, it is not absolutely requisite to double-lock it, as the ordinary key only, may be used, except where greater security is required.

The last part of these improvements apply to a mode of securing the key-hole, by the application of a seal; which seal is destroyed on attempting to raise the sliding door of the key-hole. At the bottom of the sliding door of the key-hole, on one side, a blunt knife is attached, which projects into a case or enclosure, on one side of the door, in which the seal is placed. The case is closed by a lid, which has an opening in it, secured by small bars; through this the seal may be viewed; and the lid has a spring, by which it is forced open on being set free. By the side of this spring is a catch, which, on the lid being closed, is

caught by a bar placed in the case, this bar being actuated by a spring. Part of this bar extends into the interior of the lock, and is operated on by the tumblers.

After the bolt has been projected, and the door of the key-hole pulled down, the lid of the case is lifted up, and the seal formed on the inside of the case, the surface being punched to make the wax adhere; the lid of the case is then closed, and is secured by the bar. Now, if a person, in order to pick the lock, raises the sliding door of the keyhole, the blunt knife attached to it, catches against the lower end of the seal, and as it ascends, destroys it. An impression of the seal is likewise prevented from being taken; for to effect that, the lid must be opened, which can only be done by unlocking and raising the lid; to do which the seal is destroyed.

The patentees claim the simplified form and arrangement of the parts of the lock, which renders the same suitable for the application of the simple kind of detector, whereby all the properties and advantages of the most complicated detector lock, heretofore manufactured, are obtained, but with much less workmanship and cost. Also the mode of giving to such single detector locks, the additional security of double locking, by an additional and different key, without any complexity or great increase of workmanship. And lastly, the mode herein described of applying a seal to secure the key-hole of a lock from being opened, without detection, by the breaking of the seal.[Inrolled in the Petty Bag Office, June, 1834.]