Part IV. Of Things relating to Mathematie^&c. 565 
fmall bended pieces, fet or pricked in crofs-ways, inftead 
of Ribs : and fo ty'd all together with Fin-Whale-Bone. 
This Wooden- Work is covered all over, both below and 
above, with Seal-Skins , fewed together with Leathern- 
Thongs. Saving, that towards the middle, is an Oval Hole, 
encompaffed with a Rim about four inches high, big 
enough for a man to fit down in. 
In length,feventeen feet. From the Centre of the faid Hole 
or vSW,forward,Ten feet 3 from thence,backward,feven. In 
breadth at the Seat, a foot and k In depth, backward, feven 
inches and ? 3 forward, a foot 3 becaufe of the mans feet. 
And the Boat feems thereby to be carried forward with the 
more eafe : as a Coach, in being hung higher behind. The 
whole Boat is anfwerable to a great Bladder, in which, 
though the Waves dafh and beat over it never fo much, the 
man (till fits fafe. 
He makes ufe but of one Oare, about nine feet long. 
Made of Ajh, and fhaped fomewhat anfwerable to a ftrong 
Bow. In the middle, an inch and ? thick, and an inch and 
* broad, by the Horizontal meafure : towards both ends, 
about * of an inch thick, and two inches and \ broad, by 
the Vertical. At each end is fatten d a Padle, here wanting. 
This Oare he holds in the middle, and Rowing with both 
ends alternately, makes it ferve inrtead of two. 
War. A GUN affixed to an Iron Triangle 3 the middle 
of the Gun, to one of the Angles 3 and the Breech, to the 
middle of the fubtended fide: and fo to be faften d to a Floor 
or fteady Frame, either at all the three Corners, or only at 
one of the hinder. Contriv'd by my Lord Vicount 
Brouncher , for the making of Experiments of the RE- 
COILING of Guns. Delineated in the tliftory of the 
Royal Society, (a) Together with the Experiments made 00 Part 2 
herewith by his Lordlhip 3 firft before the faid Society, p * * 33 ' 
and afterwards before the King : fet down in a Table of 
five Columns. The Firft Ihewing the Corner (toped from 
Recoyling3 the Second, the different Charges of Powder 5 
the Third, the Diftances to which the Bullet was carry 3 d 
wide of the mark, the Fourth, the fide on which it was 
carry'd 3 the Laft, the diftance of the Mark from the Muz- 
zle of the Gun. As alfo, the Caufes affigned by his Lordfhip, 
for the particulars moft obfervable, 
• An 
