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The watches of this Invention being made in small, shall serve for very exact Pocket-watches, and when made greater, shall be useful every where else and particularly to find the Longitudes both by Sea and Land, forasmuch as their movement is regulated by a principle of Equality, as that of Pendulum's is Cycloid, and that no kind of carriage shall be able to stop them.

philosophical transactions of the royal society of london

Extracts of three letters : The one of M. Hugens, about a new invention of very exact and portative watches, serving to find the longitudes both at sea and Land: The second, of Dr . Swammerdam, touching an un-usual rupture of the the mercentery: The third, containing some observations of Mr. Lister about the star-stones ; together with Mr Rays annotations thereon.