M I S C E L. L A N E O U S P A, P E R S. 



354' 



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Let a fpar or fpar top-maft be cut to the length of eight 

 or tea feet, or morev according to the fize of the velfel; 

 mortice fourlioles through the thickcft end, through which 

 run four oars, fi^iing them tight, exactly ux the middle; 

 to the four handles of the oars nail on four blades (made 

 of ftaves) the fize of the other ends, which will form a 

 very good water wheel, if the oars are ftrong; then fix 

 into the oppofite end, what is commonly called a crank; 

 the iron handle of a grindftone would fuit extremely well ;. 

 if not to be had, any lh*ong bar of iron may be bent into 

 that form, wedging it tight, to prevent its twilling round; 

 then nail up a new pair of chaps on the fore part of the 

 pump, for a new handle to be fixed in, which will ooint 

 with its outer end to the bow of the veflel; this handle 

 will be ihort on the outfide, but as long pn the infide as 

 the diameter of the bore of the pump will admit, in order 

 that the fpcar may be plunged the deeper, and of courfe 

 make the longer ftroke; the handle muft be large enough 

 to have a flit fawed up it, fufficient to admit a (lave edge 

 ways, which mufl be fattened with a flrong or iron pin, 

 on which it may work ; the lower end of the (lave mufl: 

 be bored, to admit the round end of the crank; then fix 

 the fhaft with the oars (or arms) over the gunwale on two 

 crotches, one fpiked to the gunwale, and the other near 

 the pump, cutting in the fliaft a circular notch, as well to 



make it run eafier, by leflening the fridion, as to keep 

 the whole fteady, A bolt muft be fixed in each crotch, 

 clofe over the fliaft, to keep it from rifing; as foon as the 

 wheel touches the water, it will turn round, and the crank, 

 by means of the ftave fixed on its end, will work the 

 handle of the pump. If the bore be four Inches, and the 

 pifton or fpear moves eighteen inches at a ftroke, it will 

 difcharge 220 cubic inches of water, and admitting the 

 arms of a wheel to be fix feet from the center, it will turn 



round about 146 times in a mUe, or 730 times in an hour, 

 when the fliip fails five knots, which is equal to nine !iog« 

 flicads. If the furface of the water in the whole be fifteen 



feet 



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