There is an inconvenience that often happens, these thin Partitions, especially if they be made of unseason’d Stuff, _viz._ as the Stuff dries it shrinks in the Grooves of the _Frame_, and so not only grows loose, but sometimes starts out above the top of the _Frame_. To prevent this inconvenience, I have of late caused the ends of these thin partitions to be made Male-Duf-tails, broadest on the under-side, and have them fitted into Female-Duf-tails in the Frame of the _Case_, and middle Rail before the bottom Boards are nailed on. That the Partitions be full an _English_ Body thick. That the Partitions lye close to the bottom of the _Case_, that so the _Letters_ slide not through an upper into an under _Box_, when the Papers of the _Boxes_ may be worn. §. 4. _Of_ Frames _to set the_ Cases _on_. _Frames_ are in most _Printing-Houses_ made of thick _Deal-board Battens_, having their several _Rails Tennanted_ into the _Stiles_: but these sorts of _Frames_ are, in respect of their matter (_viz._ _Fir_) so weak, and in respect of their substance (_viz._ little above an Inch thick) so slight, that experience teaches us, when they are even new made, they tremble and totter, and having lasted a little while, the thinness of their _Tennants_ being a little above a quarter of an Inch thick, according to the Rules of _Joynery_, as I have shewn in _Numb._ 5. §. 17. They Craze, their _Tennants_ break, or _Mortesses_ split, and put the _Master-Printer_ to a fresh Charge. It is rationally to be imagined that the _Frames_ should be designed to last as long as the _Printing-house_; and therefore our _Master-Printer_ ought to take care that they be made of matter strong enough, and of substance big enough to do the Service they are intended for; that they stand substantial and firm in their place, so as a small Jostle against them shake them not, which often reiterated weakens the _Frame-work_, and at that present is subject to shake the _Letter_ in the _Galley_ down. I shall not offer to impose Rules upon any here, especially since I have no Authority from Prescript or Custom; yet I shall set down the Scantlings that I my self thought fit to use on this occasion. A Delineation of the _Frames_ are in Plate 1. at C. _a a a a_ The _Fore-Rails._ _b b b b_ The _Hind-Rails._ _c_ The _Top Fore-Rail._ _d_ The _Bottom Fore-Rail._ _e_ The _Top Hind-Rail._ _f_ The _Bottom Hind-Rail._ _g g g g_ The _End-Rail._ _h h h h Cross-Bearers._