Of Winds and Sounds;

of Incidence ; in the same planner asbe shewn in regard to the Rays of Ligh*-'Hence a Repetition of the Sound, heard by

dire#

At Hornchurcb Church,North Qkendon Church,

Upminjler Mill,

Little Warley Church,Rainham Church,

Alvel Mill,

DagenhaM Mill,

South Weal Church,East shorn don ChurchHarking Church,

Guns at Blackheaih ,

9

— 0,9875

—

2,0°^

-84.

s 2zf 7

2,004

123 j

■-2,4

1

27 s

— 3,0

—

2,97

ZZh

— 3>5 8

—

3>59

33

~ 3.5 8

—

3’5 1

35

— 3> 8 5

—

z,7?

If

45

— 4.59

46 s

— 5>°9

—

$’°1

7,6*

7 °i

— 7,7

—

116

— 12,5

—

■ by

11. The great Exactness of measuring Distances^Sounds appears from the above Table, as well a s fEquability of the Motion ; but to render this M a£ ^ %still more certain and indisputable, the Doctor tooJourney to Foulness Sands on the Coast of EJsex, ^ ^form a large smooth Plain for Miles. On this Pl al R uJlmeasured 6 Miles in a right Line, and causing a ^jsto be fired at the End of each Mile, he found th& £former Observations were very just and true, andSound pafs’d the first Mile in 9J Half Seconds, JMiles in i8», three Miles in 27 1 , and so on to the

of the six. c {

12. The Academia del Cimento made Experiment.this Sort, from whence they concluded, that the

city of Sounds was so far equable, as not to be ac c ^ trated or retarded by conspiring or adverse Winds; ^in this they led themselves and many others into a 8 0Mistake, which was owing to their firing Guns anear a Distance; for in great Distances the DinfL 0 (is sensible, as will appear by the followingmany Experiments which the Doctor made on thefired at Blackheath , at the Distance'of twelvefrom his House at Upminjler. -p e l).

1704-

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