pari&a of ttle leBgtfi of Curve wuE Sereigbt ouc^j 
which afgutncBt, by reafon of its cxcelkncy and novelty, he 
acknowledges to have profecuted further , than his prcfent 
deiigo required, Where occurs the way of finding a ftrcight 
lioecqual toaPrfra^tf/o/ii jHVcntcd by that iDteiligcDt Englijh 
GcDdeman William Neile^ fioceloatch't from us by an untime- 
ly death 3 to the exceeding great regrett of thofe that knew 
his worth/ 
Beftdes, for the clearer explication of the nature of the 
Compounded Tendulum ^ the ufcfulnefs whereof he ftiews in 
the coaftru<9:ion of thefe Antomatayhe thought fit to fubjoyn^ 
thercuDto the fpcculation of the Centers rf Agitation in 
which occurr many confiderable Theorems, appertaining to 
linear, plain and folid figures. 
To ^11 which he promifes the Mechanical Strufl:ure of the 
Watch^and the Application of the Fe»^/»/iw«i thereto enrich- 
ing that pare with his Table of thcJE^jHaticnrfDayesy as al- 
fo with a Relation cf the feveral fucccfles of (uch Watches 
employed in confiderable fea- voyages ^ of which he faith th^ ' 
beft of all hath been, which was found in the Expeditior^ ofs 
the late Duke of Beaufort into €a»dia^v/ho having taken with 
Mm in his own (hip two of thofe Watcbcs^ and appointed a 
goodAftronomerto take care of them 5 The longitudes oS? 
the^placesj which they either touched at in that voyage , 01^'^ 
which in pafliogby they ceuld fee^were by means of the faid 
watches exaftly meafured, fo as that the very fame differences 
of longitudes were found by the accurateft Maps afSgned to 
thofe places. 
But foce thofe Tryals, our Author affirms to have impro- 
ved his watches by ufing a Pendulum of a Triangular figure » 
and by an other way of fufpending them ." of which he gives 
an ample defcription 5 to which we refer the Reader : con-*^^ 
eluding this account with taking notice of his Vniverjal and? 
V€^eiud'Mea[Hrey \N\^ he cftablifccth by exaftly taking the 
meafure of the diftance fi^om the point of fufpenfion to the 
ceoteir of agitation of a fimple Tendnlummhtmug a feco^d of 
Time - which ^ing found to be foch a length as feeing divided- 
iQto three equal parts will make fucha roeafure, as he calk ac^ 
Hai^ary 
m 
