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dock-yard at Portfmouth an extraordinary motion of 
the waters in the north dock, and in the bafon, and 
at two of the jetty-heads. 
In the north dock, whofe length is about 220 
feet, breadth 74 feet, and at that time about 17-^ 
feet depth of water, fliut in by a pair of firong gatls‘ 
well fecured, his Majefty’s fhip the Gofport of 40 
•guns, was juft let in to be dock’d, and well-fta/d 
by guys and hawfers (certain large, ropes fo called). 
On a hidden the ftiip ran backwards near three feet 
and then forwards as much, and at the fame time 
ihe alternately pitch’d with her ftern and head to the 
depth of near three feet ; and, by the libration of tha 
water, the gates alternately opened and ftiut, reced- 
ing from one another near four inches. 
In the bafon, whofe length is about 240 feet, 
breadth 220 feet, and at that time about 17 feet 
depth of water, ftiut in by two pair of gates, lay 
the Berwick of 70 guns, the Dover of 40 guns, both 
in a diredion nearly parallel to the Gofport ; and a 
merchant ftiip of about 600 tons, unloading of tar 
lying in an oblique diredlion to the others. Thefe 
ftiips were obferved to be agitated in like manner 
-with the Gofport, and the tar-ftiip to roll from fide 
to fide : The fwell of the water againft the fides of 
the bafon was obferved to be nine inches ^ one of the 
workmen meafured it between the librations. 
The Naftau, a 70 gun ftiip, lying along-fide a 
jetty-head, between the north dock and the bafon ; 
alfo the Duke, a (?o gun fhip, lying againft the next 
I city, head, to the fouthward, both in a diredion 
nearly at right angles to the others, were obferved to 
be 
