( m ) 
An Account of Dr Robctt Hook's Invevtion of 
the Mmne Batometer^ with its Defer iftion and 
Vjes^ fubli(hedby order of the'RyScatty^'byE 
Since it was fir fl: found ti^ th^Xorricellian Ti^ik^ com- 
tnonly cd]kd Barometer^ by the rifing 
and faliing of the ^ic^filver therein, doth prefage the 
Changesof the Air^ in relation^^^^^t^ fair and foul weather 
upon federal years obfervation oi it,it has been proved and 
aojufted for. that purpofe by Dr Roh^^rt Hook 5 and there 
have been by him many attempts to improve the Inftra- 
ment, and render the Minute Divifions on the Scale there^ 
of niore fenfiHle. He alfo Judging that it might be of 
great ufe at Sea, contrived (eyeral ways (;o make it fer- 
viceabie on board Ship 5 one of which he explained to 
the Fx.r Society at their weekly meeting in Grefkam Col- 
iedgey Jamarji 2, ,i66l, fince which time he hath further 
ct^ltivated the Ii-peutipn, and fome years ago produced 
;before^ the i^r^ofkty^ the Ihftrument I aai , no w , to de- 
-{cribe,^vhicb-^ and uletulneft, {eemeth to 
^furpais !all ptHer perfbrrpaiices of the like nature, 
jTill fuch time as the; Authors prefent Indifpofitip:n 
will give him leave to rbeftpw freely his thoughts on 
this fubjej£t upon the Pablick, it is fhe opinion of the 
Society, 5. that ilich an account be given of this /Contri • 
vance, as may render it known, and recommend: it to 
the Mariners ufe, for which it was principally intended. 
The Metcurial Barometer requiring a perpendicular 
pofture, and the Qiiick-rfilver vibrating therein with great 
violence upon any Agitation^ is^^tl\er;ciQrp jjac^^ 
V " beins 
