On the Square Pin is fitted a _Winch_ somewhat in form like a Jack-winch, but much stronger; the _Eye_ of which is fitted upon the Square aforesaid, and Screwed up tight with a Female-Screw. On the straight Shank of this Winch is fitted the _Rounce_, marked _e_. The round ends of this _Axis_ are hung up in two Iron-Sockets (as at _c c_) fastned with Nails (but more properly with Screws) on the outside the Wooden Frame of the _Ribs_. The _Girt-Barrel_ marked _d_ is Turned of a Piece of Maple or Alder-wood, of such a length, that it may play easily between the two Wooden _Ribs_; and of such a diameter, that in one revolution of it, such a length of _Girt_ may wind about it as shall be equal to half the length contained between the fore-end Iron of the _Tympan_, and the inside of the Rail of the _Inner-Tympan_; because two Revolutions of this _Barrel_ must move the _Carriage_ this length of space. This _Barrel_ is fitted and fastned upon the Iron _Axis_, at such a distance from either end, that it may move round between the Wooden _Ribs_ aforesaid. ¶. 17. _Of the_ Press-Stone. The _Press-Stone_ should be Marble, though sometimes Master _Printers_ make shift with Purbeck, either because they can buy them cheaper, or else because they can neither distinguish them by their appearance, or know their different worths. Its thickness must be all the way throughout equal, and ought to be within one half quarter of an Inch the depth of the inside of the _Coffin_; because the matter it is _Bedded_ in will raise it high enough. Its length and breadth must be about half an Inch less than the length and breadth of the inside of the _Coffin_: Because _Justifiers_ of Wood, the length of every side, and almost the depth of the _Stone_, must be thrust between the insides of the _Coffin_ and the outsides of the _Stone_, to Wedge it tight and steddy in its place, after the _Press-man_ has _Bedded_ it. Its upper-side, or Face must be exactly straight and smooth. I have given you this description of the _Press-Stone_, because they are thus generally used in all _Printing-Houses_: But I have had so much trouble, charge and vexation with the often breaking of _Stones_, either through the carelesness or unskilfulness (or both) of _Press-men_, that necessity compell’d me to consider how I might leave them off; and now by long experience I have found, that a piece of _Lignum-vitæ_ of the same size, and truly wrought, performs the office of a _Stone_ in all respects as well as a _Stone_, and eases my mind, of the trouble, charge and vexation aforesaid, though the first cost of it be greater. ¶. 18. _Of the_ Plattin _marked_ d _in Plate_ 9.