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(3)

whatsoeuer contriuance whether by mercury water or any
other liquor, and whether by a plaine or any other ways
a wheel Barometer or by any other ^/more/ compounded instrument
/Inuented/contriued for that purpose, should be reduced to one standerd of
Inches and parts .. . . And that together wth. such
obseruations care should be taken to obserue and register the
various changes of the constitutions and mutations of the
air that happen at those places. to wit the quarter &
strength of the wind, the transparency & opaceusnesse
of the air. as also its present constitution as to heat
& cold, Dryness& moysture, cloudyness & clearnesse and the
like, that soe from the comparing of these seuerall obseruati
ons together a theory mght be made of the said mutations
Grounded vpon obseruations and experience the sure Guides in
all Inquirys of this nature.
And whereas mr. Hooke had read in the minutes of the last Day that he
had contriued a barometer by wch. an infinite number of small
mutations of the air might be Discouerd which would be
wholy Inuisible and Insensible by the .. . . more common
Air poises, the ^/President/ was pleased to admonish him that whateuer the
contriuance were he should reduce it to a certaine-standerd
of Inches and parts as Decimalls centesimales or Thousanth
parts of inches

vpon this it was affirmd that Sr. Jonas more affirmed that he
had kept an account for some time of the these mutations
as also that mr. Townly had for a longer time.
Dr. Croon affirmd that he had also made some obseruations
of this kind and kept an account thereof.
The like was affimd by mr. Hooke
It was also asserted that Dr. Wallis and seuerall other mem
bers of this Society had Done the like which it was hoped
would in time be all Collected into the Registers of this Society
as the proper place where all matters of this kind might be
kept vpon Record

Ref: CELL/RS/HF_123  © Centre for Editing Lives and Letters