Boyle WorkdiariesWorkdiary 19Page 1 of 57
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1
London, Augst. the 24th.

The Velocity of an Iron Ball about 2 Inches Diameter being let fall, was found by an accurate Instrument to move 15 1/2 foot in a 2d minute of time. And 38 foot deleted

This [Exp{superscript t}] was made & repeated at
the Turret in Chelsy    space of 3 lines

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2

We went to the Schooles <at Oxford>in Boyle hand & with an exact Instrument where single Vibrations were half seconds, we measur'd the encrease ofaltered from '&' velocity of a descending Ball of Iron fastend by a string to the Instrument, & for the most part our Observations agreed in this That in 4 single Vibrations & e deletedvery little more, the Iron fell the height between the Battlements of the Schoole & the deleted & the Pavement amounting to 35 feet, & letting fall the Iron deleted 56, then we shorten'd the String & made it sometimes 36, sometimes 35 feet, & leting fall the Iron we found as we expected, that it fell downe that length in 3 single Vibrations, & when the length was 36 the Pendulum seem'd to begin to be upon the returne. The same Ball let fall from the Tower [of]tear at edge of page the Schooles where it is 80 foot high appeard to fal[l]tear at edge of page somewhat less than 5 semiseconds <or perhaps in 4 half &> & a half. And by [the]tear at edge of page