633

1672

Dec: 4.
RH affirmd vpon tryall that he found the air neither increase nor decrease sensibly by burning
the tryall miscarried. he promised the heads of a Discourse he read about the new proprietys
of Light . & to bring in the Reflex speculum next Day
Dec: 11. nothing
Dec. 18. RH absent & sick. Swamerdams vterus. company well pleasd.
Ian: 8. Grews Idea. RH. to prepare . Ian: 15. 0. Ian: 22 RH produced an object
Reflecting specul. drawing 9 foot. wch. he hoped would doe as much as one of 100f. orderd
to perfect it. Leibnitz shewd his Arithmetick Engine. Ian: 29. RH shewd the glasse
better polisht. Feb: 5. RH produced the specul: object made true not polsht.
wch. he would doe against next Day. he now mentiond his Arithmetick engine. encouragd
to perfect it. RH orderd to get a weather clock. RH named the petrifying ground
in Befordshire seconded by Sr. R moray. Sr. R morays center fish petrifyd. presented.
RH affirmd Amber to be resin petrifyd. Feb: 12 noe meeting. Feb: 19. the musk deer
skin. Boyles black willow twig presented. RH tryd fier Expt. again wthout Successe
march. 5. RH tryd fire Expt. again but faild. he produced his Arithmetick Engin & was
applauded. RH promised a lecture of weatherclock
march 12. RH read his first part of a Discourse of a weatherclock. he vndertook to make
the engine and Read the 2d part of the Discourse. Schroters mosse scull -
R H. read a Discourse of Diminishing air a /20/ twelft part by burning. Desired to pro=
secute it & to call members to assist. minded of the weather clock & specular object
march. 26. RH. Shewd the penetration of water by oyle of vitrioll. Cassini new planet
about . Gregorys Letter to Collins about the charges & apertures of Refracting
& reflecting Object glasses, and of oblique reflections 1673
Ap: 2. RH tryd expt of penetration of oyle of tartar & . vnsuccesfull. -
Ap: 9. RH. tryd & brasse wire; the liquor /took/ Less space considerably. promisd to bring
in the account in writing. Ap: 16: RH orderd to prosecute these tryalls &
bring in his account in writing. RH. affirmed spirituous liquors though
closed would loose their proprietys in time.
Ap. 23. RH produced air by and oyster shells. Herberts cinnamon. wormius his
book de mure norwegico. Old keeps it though sent by mr Henshaw to RS.
Ap. 30. noe Society. may 7. generated air producd. and proposed to be tryd whether
fitt for burning or respiration &c this expt. to be tryd wth other bodys. RH propouned
to try precipitation of Liquors in order to the increase or consumtion of air
RH read his paper about Arithmetick Instruments. the paper to be registred.
Sr. S: morelands book bought
may. 14 RH. found new air of & oyster shells vnfit for burning. to be tryd again next
day. may. 21. RH's Expt. not Ready may. 28. new Generated air found vnfit
for fire and resembling a riue dampe.
Iune 4. Air of bottle ale vnfit for fire. RH. queryd whether precipitation might
not recruit this burning faculty now Lost. Sr. S: morlands force pump first proposed
R H propound a way of weighing. Iune 18. Boyles liquor tinging pa copper
through a paper. Soc: adjournd.
Oct: 30. weather clock & Discourse calld for Nou. 6. RH shewd expt. of a
canopy of water closing towards the bottom. Society Resolud to Returne to Gresh[am]
colledge. nouem: 13. Account of the. Last Days Expt. calld for. RH Shew expt. of ben
ding glasse pipes by flame of a Candell. RH mentiond that he had Explained the theory
of springiness Long since In a Discourse of his brought in vpon occasion of the phenom
ena of mercury standing aboue its vsuall station . he was desired to bring in that Discou[rse]
nou: 20 . RH. shewd the RS the Germans Ioynted microscope wth one glasse. the account
of water experiment and Elasticity calld for.

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