The _Flat-Gage_ is described in _Plate_ 10. at A. It is made of a flat piece of Box, or other Hard Wood. Its Length is three Inches and an half, its Breadth two Inches and an half, and its Thickness one Inch and an half. This is on the Flat, first made Square, but afterwards hath one of its Corners (as _h_) a little rounded off, that it may the easier comply with the Ball of the Hand. Out of one of its longest Sides, _viz._ that not rounded off, is Cut through the thickness of it an exact Square, whose one side _b f_, _c g_ is about an Inch and three quarters long; and its other side _b d_, _c e_ about half an Inch long. The Depth of these Sides and their Angle is exactly Square to the top and bottom of the upper and under Superficies of the _Flat-Gage_. Its Use is to hold a Rod of Steel, or Body of a _Mold_, _&c._ exactly perpendicular to the Flat of the _Using-File_, that the end of it may rub upon the _Using-File_, and be Filed away exactly Square, and that to the Shank; as shall more at large be shewed in §. 2. ¶. 3. ¶. 4. _Of the_ Sliding-Gage. The _Sliding-Gage_ is described in _Plate_ 10. at _Fig._ B. It is a Tool commonly used by _Mathematical Instrument-Makers_, and I have found it of great use in _Letter-Cutting_, and making of _Molds_, _&c._ _a a_ the Beam, _b_ the Tooth, _c c_ the Sliding Socket, _d d d d_ the Shoulder of the Socket. Its Use is to measure and set off Distances between the Sholder and the Tooth, and to mark it off from the end, or else from the edge of your Work. I always use two or three of these _Gages_, that I need not remove the Sholder when it is set to a Distance which I may have after-use for; as shall in Working be shewed more fully. ¶. 5. _Of the_ Face-Gages, _marked_ C _in Plate 10._ The _Face-Gage_ is a Square Notch cut with a File into the edge of a thin Plate of Steel, Iron, or Brass, the thickness of a piece of common Latton, and the Notch about an _English_ deep. There be three of these Gages made, for the Letters to be cut on one Body; but they may be all made upon one thin Plate, the readier to be found, as at D. As first, for the Long-Letters; Secondly, for the Assending Letters; And Thirdly, for the Short-Letters. The Length of these several Notches, or Gages, have their Proportions to the Body they are cut to, and are as follows. We shall imagine (for in Practice it cannot well be perform’d, unless in very large Bodies) that the Length of the whole Body is divided into forty and two equal Parts. The _Gage_ for the Long-Letters are the length of the whole Body, _viz._ forty and two equal Parts. The _Gage_ for the Assending Letters, _Roman_ and _Italica_, are five Seventh Parts of the Body, _viz._ thirty Parts of forty-two, and thirty and three Parts for _English_ Face. The _Gage_ for the Short-Letters are three Seventh Parts of the whole Body, _viz._ eighteen Parts of forty-two for the _Roman_ and _Italica_, and twenty two Parts for the _English_ Face.