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nou. 18. 63. RH shewd the company his module of the whale shooting engine some objections being made
against it it was orderd tht Dr wilkins Dr wallis & mr Hooke should meet together on tuesday next to consider of it
the same was put in mind to bring in his additions to P R. instrument of perspectiue wth. a full description thereof
the same was orderd to make a pastbord module of his engine wth one wheel to trauaile in wth. ease & speed. also of his other
engine to travell ouer Land & water by walking in it after the fashion of the wheel of a crane .
nou. 25. RH brought in an account of his addition to PR perspectiue engine. orderd such an engine should be made for RS
RH told that he had alterd his thought about the whale engine. proposing now a crosebow made of whale bone. twas objected what
bones would Loose their spring by wet. when RH suggested varnish. others that a Steel bow of seuerall thin ones tind would doe
better. RH Desird to consider further thereof.    RH produced his engine to try powder by weight but being imperfect
by the non continuance of the first Impulse he offerd to compleat it by the addition of a Rammer. RH shewd the microsco
picall obs: of Silkwormes eggs. Expts. for next Day PR powder tryer. 2 wind gun. 3 compressing engine. De
Dec. 2. DC presented 50ll. Sr. Ch: Wrens weather Clock produced. RH. bespoke PR perspectiue of Thomson. Boyle suggested
  degrees of cold beyond freezing. [which he had fro RH] PR powder. mr Hoskins. when water Rises between alhallontide
  & michaelmas springs neuer fail
Dec 9. Dr. wrens weatherclock read. RH propounded additions. 1 1st. seald thermometer. RH expt. of weight like glasse bubbles in the
  compressing engine made wth successe & he orderd to bring in an account. Dr. wilk suggested Deers hair tubulous. RH orderd
  desired to examine deers hair & mr Claiton promisd east India deers hair. Pnewmatick engine from Ld Brounkers. RH to consi
  der farther of whale engine. a Locust tree bow not Loosing spring in 6 monthes mr Hill.
Dec 16. RH. paper of weighing glass bubbles in condensing engine read & Registred.
Dec 23. RH. to examine Dr. Ents Lignum fossile in microscope. produced new perspectiue engine wth. his own additions to
  cast embost things into perspectiue as well as platformes: but two rulers to be put insteed of two threeds.
  gun barrell to condensing engine microscopicall Deers hair produced. Dr. wren Dr. Godderd & RH. curators of
monconys engine way of weighing bodys
Dec 30. RH. suggested a standerd of cold by the degree that freezeth Distilld water. RH. produced a little engine to make the
  ascent & Descent of in glasse canes more discernable to produce it next day
Ian. 6. 63. expt of shooting wth. windgun applyd to compressing engine tryd made dint in boord able to kill a
  man at 20 yards. RH to bring in an account. RH. to prepare standerd for cold. to weigh full & exhau
  sted Receiuer. & to try to raise bubbles by condensing air. Pascalls treatise of Hidrostaticks.

Grasse Ropes

  RH. to prepare wheel wth hollow cameras. bettnius.
Ian. 13/20/27. RH. to Repeat the Expt of Bubbles swimming in condensd air. & to try the expt. of putting some springs
  wth. a weight both in the Rarifying & condensing engine to see wt. force the Differing air hath vpon them
Feb: 3. RH. account of the weight of the air in a large Rr. of 119 English wine pints and of the proportion of the
  weight of the Air to the weight of the water was Read. RH was orderd to make Expts. of compressing -
  water & glasse. he also mentiond that he had exposed springs to the free air. But that not wthstanding
  a considerable alteration in the air he had not found any alteration in the springs. mr. Boyle sugges
  ted that a spring might be bent to a certaine degree and putt into a cylindricall glasse wth Ice & snow
  about it to see wt. alteration would be wrought vpon the Spring. RH. was orderd to try springs wth
  appendent weights both in the Rarifying & compressing engine to see wt. effects the Rarefaction & condensation
  of the air hath vpon them. He related to haue shaped ice into a Lens but found noe heat from the sun
  nor noe figure of the sunn. A Discourse of R Boyles foysted in. vnjustly.
Feb: 10 RH repeatd expt of weighing air. Godderd Ball Whistler Hooke to prepare for obseruing in
  - RH. to conuey a continuall stream of air to a ball vnderwater. 2 to try the strength of woods 3. to try springs
  in the Rarifying & condensing engine
Feb: 17 Expt. of supplying air by a bell vnder water by buckets was tryd wth successe. RH orderd to get a module of his
  bag for a Diuers respiration wch. he is to supply from the bell or tubb. RH proposed deep spectacles to see
  vnder water. S R moray - mentiond that Zulichem desired to know the size of tubes where Remains suspended. .
march 2d RH tryd Expt. of birds in comon Rarifyd & condensd air. RH produced bellows for vsing air vnderwater
  and propounded a better & safer way. by two boxes & two cylinders &c.
mar. 9. RH tryd the expt. of bird in condensd air wth successe. orderd to be further condensd. RH. produced Leaden boxes for
  diuing. a comet seen at Gratz Ian 2. 1663.
mar. 16. Sr. R M exhibited a letter of mr. Zulichem conteining an account of . . . the Expt. of the Suspension of and of
  some parisions pretending to know the cause thereof. RH gaue an account of the bird in condensd air. order
  to repeat it in a greater condensator breaking wood orderd. Sr R m. reported PR mechanician would raise
  water by suction to any height . a pistol shoot as fast as presented. 3 wind gun As big as ones thumb to shoot a needle through
  a 3 inch boord of oak. 4 a windgun to shoot as far as wth powder. Elephants Hair deliuerd to RH to examine
  wth. microscop
mar 30. RH. gaue an account of Bird in Condensd air. Boyles book of colours presentd. Ld Brounker desired to giue the figure
  of a beam equally strong. RH orderd to proue the Stretching of glasse
Ap.6. proued by Expt. Ap. 13. RH mentiond his own way of compressing water and tht water would not at all com
  presse by a strength that would condense water air into 1/11 he brought in 2 accounts 1 of Rising of water in bolt

Ref: CELL/RS/HF_013  © Centre for Editing Lives and Letters