The _Ribs_ are delineated in Plate 8. at E, they are made of four square Irons the length of the _Wooden-Ribs_ and _End-Rails_, _viz._ four Foot five Inches long, and three quarters of an Inch square, only one end is batter’d to about a quarter of an Inch thick, and about two Inches and an half broad, in which battering four or five holes are Punch’t for the nailing it down to the _Hind-Rail_ of the _Wooden-Ribs_. The Fore-end is also batter’d down as the Hind-end, but bound downwards to a square, that it may be nailed down on the outer-side of the _Fore-Rail_ of the _Wooden-Ribs_. Into the bottom of these _Ribs_, within nine Inches of the middle, on either side is made two Female-Duftails about three quarters of an Inch broad, and half a quarter of an Inch thick, which Female-Duftails have Male-Duftails as at _a a a a_ fitted stiff into them, about an Inch and three quarters long; and these Male-Duftails have an hole punched at either end, that when they are fitted into the Female-Duftails in the _Ribs_, they may in these Holes be Nailed down the firmer to the _Wooden-Ribs_. [Illustration: _Plate 9._] These _Ribs_ are to be between the upper and the under-side exactly of an equal thickness, and both to lye exactly Horizontal in straight lines; For irregularities will both Mount and Sink the _Cramp-Irons_, and make them _Run_ rumbling upon the _Ribs_. The upper-sides of these _Ribs_ must be purely Smooth-fil’d and Pollish’d, and the edges a little Bevil’d roundish away, that they may be somewhat Arching at the top; because then the _Cramp-Irons_ _Run_ more easily and ticklishly over them. The _Cramp-Irons_ are marked F in Plate 8. They are an Inch and an half long besides the Battering down at both ends as the _Ribs_ were; They have three holes Punched in each Battering down, to Nail them to the _Planck_ of the _Coffin_; They are about half an Inch deep, and one quarter and an half thick; their upper-sides are smoothed and rounded away as the _Ribs_. ¶. 16. _Of the_ Spindle _for the_ Rounce, _described in Plate_ 9. _at_ a. The _Axis_ or _Spindle_ is a straight Bar of Iron about three quarters of an Inch square, and is about three Inches longer than the whole breadth of the Frame of the _Ribs_, _viz._ two Foot two Inches: The farther end of it is Filed to a round Pin (as at _a_) three quarters of an Inch long, and three quarters of an Inch in Diameter; the hither end is filed away to such another round Pin, but is two Inches and a quarter long (as at _b_); at an Inch and a quarter from this end is Filed a Square Pin three quarters of an Inch long, and within half an Inch of the end is Filed another round Pin, which hath another Male-Screw on it, to which is fitted a square Iron _Nut_ with a Female-Screw in it.