£ 5 ° Mijcellanea Curio fa. 



An Account of Dr. Robert Hook Y 

 Invention of the Marine Baro- 

 meter^ with its Definition and 

 Vfis ; publi/hed by order of the 

 Royal Society^ by E. Halley, R. 



s. s. 



Since it was found that the Torricellian Tube, 

 commonly call'd the Mercurial Barometer, 

 by the rifing and falling of the Quickjiher 

 therein, doth prefage the Changes of the Air, 

 in relation to fair and foul Weather ; upon 

 leveral Years Obfeivation of it, it has been 

 proyed and adjufted for that purpofe by Dr. fy- 

 bert Hook^ , and there have been by him ma- 

 ny attempts to improve the Inftrumenr, and 

 render the Minute Divifions on the Scale 

 thereof more ienlible. He alfo judging that 

 it might be of great ufe at Sea, contrived fe- 

 veral ways to make it ferviceable on Board of 

 Ship \ pne of which he explain'd to the t{pyal 

 Society at their Weekly Meeting in Grefham Col- 

 lege* January ^. 1 66|. Since which time he 

 hath further cultivated the Invention, and 

 fbme Years ago produced before the faid Soci- 

 ety , the Inftrument I am now to defcribe, 

 which for its (ubtilty and ufefulnefs, feemeth 



to 



