If it be objected, that since the smalness of the Break at the end of the Shanck of the Letter is so approvable and necessary for the reason aforesaid, then why may not the Break be made much more smaller yet? The Answer will be, No; because if it be much smaller than one quarter of the Body, Metal enough will not pass through the Throat, to fill both the Face and Shanck of the Letter, especially if the Letter to be cast prove thin.
Near the Throat and Jaw is made straight down through the Palate a square Hole (as at k.) This square Hole hath all its Sides on the Upper-Plain of the Palate opened to a Bevel of about 45 Degrees, and about the depth of a thick Scaboard. Into this square Hole is fitted a square Pin to reach through it; and within half a Scaboard through a square Hole, made just under it in the Bottom-Plate which the Mouth-Piece lies upon. On the upper end of this square Pin is made a square Sholder, whose under-sides are filed Bevil away, so as to comply and fall just into the Bevil made on the Palate aforesaid, and on the under end of the Pin is made a Male-screw long enough to contain a square Nut, with a Female-screw in it about a Pica or English thick, which Nut being twisted about the Pin of the Male-screw, draws and fastens the Mouth-piece close down to the Bottom-Plate, and also close to the Carriage and Body of the Mold.
Note, that the square Hole made in the Bottom-Plate to receive the square Shanck of the Pin, must be made a little wider than just to fit the square Shanck of the Pin, because the Mouth-piece must be so placed, that the end of the Jaw next the Throat must lie just even with the Body it is to be joyned to; and also that the Throat of the Mouth-piece may be thrust perfectly close to the Sides of the Carriage and Body: And when Occasion requires the Shanck of the Letter to be lengthned, it may be set farther off the Carriage, that an Asidue, or sometimes a thin Plate of Brass may be fitted in between the Carriage and the Throat of the Mouth-piece, as shall farther be shewed when I come to justifie the Mold.
¶. 7. Of the Register.
Behind the Mold is placed the Register, as at f i h, which I have also placed apart in the aforesaid Plate, as at C, that it may the more perspicuously be discerned, and a more particular account of its parts be given, which are as follows:
- C a a b c d e The Register.
- a a The Sholders.
- b c The Neck.
- d The Cheek returning square from the Plate of the Register, and is about an English thick.
- e The Screw Hole.
It is made of an Iron Plate about a Brevier thick; its upper-side is straight, but its under-side is not: For at a a projects downwards a small piece of the same Plate, which we may call the Sholders, of the Form you see in the Figure. These Sholders have two small Notches (as at b c) filed in them below the Range on the under-side of the Register, which we will call the Neck, and is just so wide as the Bottom-Plate is thick. This Neck is set into a square Notch, filed so far into the Bottom-Plate, that the flat inside of the Register may stand close against the hind-side of the Carriage and Body; and this Notch is filed so wide on the left Hand, that when the side b of the Neck stands close against the left-hand-side of this Notch (as it is posited in the Figure) the Cheek of the Register stands just even with the Edge of the Body. And this Notch is also filed so wide on the right-Hand-side, that when the Neck at c stands close against the right-hand Side of the Notch, the Cheek of the Register may remove an m, or an m and an n from the edge of the Body towards the right hand: And the Sholders a a are made so long, that when either Side of the Neck is thrust close against its corresponding side in the Notch of the Bottom-Plate, the upper Edge of the opposite Sholder shall hook or bear against the under-side of the Bottom-Plate, and keep the whole Register steady, and directly upright to the Surface of the Bottom-Plate.
In the Plate of the Register, is made a long square Hole, as at e, just wide enough to receive the Pin of a Male-screw, with a Sholder to it, which is to fit into a Female-screw, made in the Edge of the Carriage, that when the Male-screw is turned about in the Female-screw in the Carriage, it shall draw the Sholder of the said Male-screw hard against the upper and under Sides of the square Hole in the Plate of the Register, close to the side of the Carriage and Body.
The reason why the Hole in the Plate of the Register is made so long, is that the Cheek of the Register may be slid forwards or backwards as occasion requires; as shall be shewn when I come to justifying the Mold.