A _Chase_ is an Iron Frame about two and twenty Inches long, eighteen Inches broad, and half Inch half quarter thick; and the breadth of Iron on every side is three quarters of an Inch: But an whole Inch is much better, because stronger. All its sides must stand exactly square to each other; And when it is laid on the _Correcting-Stone_ it must lye exactly flat, _viz._ equally bearing on all its sides and Angles: The outside and inside must be Filed straight and smooth. It hath two _Crosses_ belonging to it, _viz._ A _Short-Cross_ marked _a a_ and a _Long-Cross_ marked _b b_: These two _Crosses_ have on each end a Male Duftail Filed Bevil away from the under to the upper-side of the _Cross_, so that the under-side of the Duftail is narrower than the upper-side of the Duftail. These Male-Duftails are fitted into Female-Duftails, Filed in the inside of the _Chase_, which are also wider on the upper-side of the _Chase_ than on the under-side; because the upper-side of the _Cross_ should not fall through the lower side. These _Crosses_ are called the _Short_ and the _Long-Cross_. The _Short-Cross_ is Duftail’d in as aforesaid, just in the middle of the _Chase_ as at _c c_, and the _Long-Cross_ in the middle of the other sides the _Chase_, as at _d d_. The _Short-Cross_ is also Duftail’d into Female-Duftails, made as aforesaid, about three Inches and an half from the middle, as at _e e_: So that the _Short-Cross_ may be put into either of the Female-Duftails as occasion serves. The middle of these two _Crosses_ are Filed or notched half way through, one on its upper, the other on its under-side to let into one another, _viz._ the _Short-Cross_ is Filed from the upper towards the under-side half way, and the _Long-Cross_ is Filed from the lower towards the upper-side half way: The _Crosses_ are also thus let into each other, where they meet at _f_, when the _Short-Cross_ is laid into the other Female-Duftails fitted to it at _e e_. In the middle, between the two edges of the upper-side of the _Short-Cross_, is made two Grooves parallel to the sides of the _Cross_, beginning at about two Inches from each end, and ending at about seven Inches from each end: It is made about half an Inch deep all the way, and about a quarter of an Inch broad, that the _Points_ may fall into them. The _Short-Cross_ is about three quarters of an Inch thick, and the _Long-Cross_ about half that thickness. All their sides must be Fil’d straight and smooth, and they must be all the way of an equal thickness. * * * * * Hitherto our _Master-Printer_ hath provided Materials and Implements only for the _Compositers_ use; But he must provide Machines and Tools for the _Press-mans_ to use too: which (because I am loath to discourage my Customers with a swelling price at the first reviving of these Papers) I shall (though against my interest) leave for the subject of the next succeeding _Exercises_. * * * * *