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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.
Published:16 March 1675https://doi.org/10.1098/rstl.1675.0005
Abstract
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.
