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orderd that mr. Hook contriue a pendulum clock applicable to obserue the changes of weather
as well and cheap as he can, for the use of the Society. The same was put in mind to haue
his Instrument Ready for Discouering second minutes by the sun. (about flat bel metall round plate
(The Expt. of Breaking a case of iron whose sides were 3/4 inch thick was tryed wth 6 penny weight
of Prince Rupert powder. which broke wth. a smart report in 3 peices, orderd to repeat this Expt
next day wth 4 or 5 penny weight. orderd to prepare the great square vessell for the tryall
of Descending bodys in Water.
Sept: 21. 1664. (heuelius Letter of thanks for Election) the Report of the vnsuccesfull Expt. of weighing at St Paules
by reason of wind. the Kings statera to be borrowed.) sounding plate for next day) Dr. wren to make the S a globe of the moon)
Sr. P Neil proferd telescope tube of 50 foot). The powder expt. tyed wth 4 penny weigh in a like case, made a report
wthout Breaking only loosned the Screw. -) There was also made the expt. of sinking a wooden ball with
a ball of Lead, in a square wooden vessell 9 foot high filld wth water hauing glasse panes in the sides
the Leaden Ball being hung in a springing wire to a ball of wood, fell to the bottom in 5". and being
fallen off by touching the bottom, the ball of wood returnd to the top in 9". and it was obserued that the
sizes of the Leaden Ball, being different . the descent was the swifter the bigger the Leaden balls were -
The 3 balls of bees wax were let fall of different sizes & the bigger descended fastest. to be prosecuted.
as also Expt. of Refraction). Item that mr Hooke giue a draught of the Ciron or wheal worm as it
appears in a microscope. -
Sep. 28. 1664. The Expt. of measuring the velocity of bodys descending in water was pro
=secuted in the vessell employed the Last day which yet wanted about 1 1/2 foot of being full of water
one of the glasses neer the top being ^ /broake/ which made soe much water ^ /before/ there were vsed bodys
of wood of the same kind and weight but of the Different figures, /1/ cubicall /2/ a double cone
whereof one end was tapering 3 inches. /3/ and the other 2. /4/ a single cone tapering 2 inches
wth. a flat basis, /5/ another of the same figure tapering one inch. /6/ A pyramid of 1: inch
/7/ and another of the same figure of 2 inches & these 3 last also wth flat Bases, /8/ then a cy
linder /9/ & a Globe, all these peices were tryed wth an appendant weight of two ounces
and came to the bottom as follow. 1 in 12 (half seconds) 2. in 9 1/2 / 3. in 9 1/2 / /both the/ same
4. in 7 3/4. circiter / 5 in 11 1/2 circiter / 6. in 10 / 7 in 8 / 8 in 12 circiter. / 9 in 9 3/4 cir
-citer) orderd that these Expts. be pursued the next Day. and the pendulum contriued for
falling bodys to be applyed thereto [wallis Letter about horrox paper] Boyle Letter about weight at Paule
about magneticall expt). refraction Expt. at Paris. Refraction of SV. greater then of water.) by campany glasses 6 belts
Discouerd in . 4 more obscure 2. more cleer than the rest of its body) Casati terre machinis mota. 143. bismute
water . . . seald in a glass. to rise in the full & fall in e new moon. - - - -
Oct: 5. 1664. The expts. of the Refraction of water & Spt of wine were made, in the former the angle of inclina
tion being 30 deg: that of Refraction was 41o & 35'. and in the Later 42o. 45'. soe tht the Refraction
of Spt. of wine was 1o. 50' greater then tht of water, the spt. of wine vpon tryall was found to be very
well Rectifyd. (Dr. Godderd suggested that the weight of spt of wine, to tht of Distilld water was as
952. to 1122. and tht conduit water & Distilld water did scarce differ in weight) -
broken potshard from Tripoly wth corrall). Dr. Charlton & mr. Hook: reported of the expt they
had made of the velocity of a bullet shot out of a musquet that as near as they could obserue
the bullet being dischargd wth P Ruperts powder went about 6 score yards in half
a second. orderd to be prosecuted [charleton of a Bussart) Anatomicall committe) The expt
of P Rupert powder was tryd in the steel case wth 3 penny weight it blew out all by the touch hole
Oct: 12. 1664. Expts of Descending bodys in water were made whereof the successe was that
4 ounces of Lead being hung to all the bodys tryd. the 1. in 9. The parallelipip: came to the bottom
in 9 half seconds. pyramid of two inches high wth. sharp end downward. 7. the Same wth the flatt end -
downwards 9. +. pyramid of one inch high wth sharp end downward. 7 1/2. The cylinder 9 fere .
cone wth point downward 7 wth flat end downward 10+. to be prosecuted - -
Refractions to be prosecuted wth. oyles waters wines Lixiueum &c. and whether the refractions
keep the proportions of the sines which is the end proposed in these Expts.
An instrument to measure the swiftnesse of the wind Recommended to Sr. W. Petty =
The bell metall plate produced proued vselesse for sounds. Referrd to Sr. R moray to shew it De Son
Dr. Smith for Paris - & -
Oct 19. 1664 (merrets catalogue of trades) zulichem Letter about satellits of : his watches fitted

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