Every _Mold_ is made of two parts, an under, and an upper Part; the under part is delineated at A, in Plate 18, the upper part is marked B, in Plate 19, and is in all respects made like the under part, excepting the _Stool_ behind, and the _Bow_, or _Spring_ also behind; and excepting a small roundish _Wyer_ between the _Body_ and _Carriage_, near the _Break_, where the under part hath a small rounding _Groove_ made in the Body. This _Wyer_, or rather _Half-Wyer_ in the upper part makes the _Nick_ in the _Shank_ of the Letter, when part of it is received into the Grove in the under part. These two parts are so exactly fitted and gaged into one another, (_viz._ the _Male-Gage_, marked C in Plate 19, into the _Female-Gage_ marked g, in Plate 18.) that when the upper part of the _Mold_ is properly placed on, and in the under part of the _Mold_ both together, makes the entire _Mold_, and may be slid backwards for Use so far, till the Edge of either of the Bodies on the middle of either _Carriage_ comes just to the Edge of the _Female-Gages_, cut in each _Carriage_: And they may be slid forwards so far, till the Bodies on either _Carriage_ touch each other. And the sliding of these two parts of the _Mold_ backwards, makes the _Shank_ of the Letter thicker, because the Bodies in each part stand wider asunder; and the sliding them forwards makes the _Shank_ of the Letter thinner, because the Bodies on each part of the _Mold_ stand closer together. [Illustration: _Plate 18._ _The Under half of the Mold_] This is a general Description of the _Mold_; I come now to a more particular Description of its parts. a The _Carriage_. b The _Body_. c The _Male-Gage_. d e The _Mouth-Piece_. f i The _Register_. g The _Female-Gage_. h The _Hag_. _a a a a_ The _Bottom-Plate_. _b b b_ The _Wood_ the _Bottom-Plate_ lies on. _c c e_ The _Mouth_. _d d_ The _Throat_. _e d d_ The _Pallat_. _f_ The _Nick_. _g g_ The _Stool_. _h h g_ The _Spring_ or _Bow_. I have here given you only the Names of the parts of the _Mold_, because at present I purpose no other Use of it, than what relates to the sinking the _Punches_ into the _Matrices_: And when I come to the casting of Letters, You will find the Use and Necessity of all these Parts. ¶. 2. _Of the_ Bottom-Plate. The _Bottom-Plate_ is made of _Iron_, about two Inches and three quarters long, and about the same breadth; its thickness about a _Brevier_: It is planisht exactly flat and straight: It hath two of its _Fore-Angles_, as _a a_ cut off either straight or rounding, according to the pleasure of the Workman.