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3 «4 j4\'N0TATI0NES ClRCA COXSTRFCT. 



requifitiim Ildnm. Aeqnaliter deinde per nmbitum libr^ 

 y j toris diflributa inertia non patitur , vt aliqu:^ acceleratio 

 olcillationis ex motu a naue imprcflTo contmgere poflit. 

 Ponamus cnim iibratorem a c olcillare cx a verliis b et 

 ex c verliis : \ nauem vero ex b verliis a , cuidcns eft 

 partibus iibratoris circa b motum imprimi vcriiis a adco- 

 que primo rntuitu apparct , qual» inde aliijua rctardatio 

 proficifci debeac. Qiioniam vcro partibus m c fmiul pcr 

 £amdem nauis ofcillationcm fimilis niotus cx c verliis e » 

 priori cx b in a contrarius , imprimitur , hacc impreflio 

 nltcram tollit , ct nulla planc inde ofciUarionis va- 

 riatio vcl turbatio contingcrc potcft. Ad quartum et 

 quintum rcquifitum obtincndum intcgrum horologium ci- 

 iVae ligneac includi potcrit , qmc ciica dilcum horarium 

 vitro cnifliori munita , cetcroquin vndiquc fcrreis flanno- 

 quc obdikfbs lamcllis probc (crruminatis vcftita fit , ita , 

 vt aer ex parte opc antliac manuariae iude cxtrahi pof- 

 fit. Einsmodi attenuatus aer nequc ofcillationi lcnlibilitcr 

 refiftit , ncquc humiditatcs fouct , ncque inlpiffationcm olci 

 pcr cuaporationcm partis aquofie admittit. Kcquifitum 

 fextum duplici modo poterit obtineri. Aut cnim potcft 

 horologium pcr fubfidia fatis cognita in viw eodcmqiic 

 caloris gradu femper conferuari ; aut , fi hoc nimis tacdio- 

 fum videatur , per obferuationes in antcccfliim dctcrmina- 

 ri , in cjuantum fpiralis libratoris intcndcnda vcl rcmittcn- 

 da fit , vt fub diucrfo caloris giadu olcillationcs (iias ea- 

 dcm celcritate ablbluat. H(k cognito per virgac mctalli- 

 cae adplicatae contradionem ct dilatationcm ifla intcnfio et 

 rclaxatio fpiralis automaticc absquc concurlu oblcruatoris 

 potcrt obtincri. Ad vkimum dcnicjuc rcquifitum obtincn- 



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