240. 
Exoeriments 
in Confort, 
touching the 
Ke flexion of 
| Sounds. 
BAL 
| Lines,-cannot be fo guided. And therefore, we fee there hath not been | 
2436 
2445 
(245. 
more. Tate. 
men that they hear. isp 
| lefs it hath been tryed, thatone leaning overa Wellof Twenty five fathom | 
Natural Hift 
more than Beafts ; becaufe naturally they are more delighted with them | 
and practife them more, as appearcth in their Singing. We feealfo, that |) 
thofe that teach Birds to fing, do keep them waking, to increafe their } 
attention. We fee alfo, chat Cock-Birds, amongft Singing-Birds, are ever } 
the better fingers, which may be, becaufe they are more lively, and liften | 
ory A | 
| | 
Labor and Intention to imitate Voices, doth conduce muchto Jmitation: | 
And therefore we fee, that there be certain Pantomimi, that will réprefent | 
the Voices of Players of Interludes, fo to life, as if you fee them not, you | 
. 0, ae 
would think they were thofe Players themfelves, andfothe Voices of ot | 
’ th, A 
There have been fomethat could counterfeit the diftance of Voices, | _ 
(which is afecondary object of Hearing) infuch fort; as when they ftand | 
faft by you, you would think the Speech came from afar off, inafearful | 
manner. How this isdone, may befurtherenquired ; but If{ee no greatufe | 
of it, butforImpofture, in counterfeiting ghofts or fpirits, NAR 
Here be three kindes of Reflexions of Sounds; a Reflexion Concurrent, a Re- | 
flexion Lterant, whichwecall Eccho, anda Super-reflexion, Or an Eccho of an a 
Eccho, whereof the firft hath been handled in the Title of Magnitude of | 
Sounds. The latter two we will now {peak of. — a 
The Reflexion of Species Mifible by Mirrers, you may command, becaufe | 
paffing it RightLines, they may be guided to any point: Butthe Reflexion 
of Sounds, is hardtomafters becaufe the found filling great fpaces in arched | 
practifed any means tomake Artificial Eccho’s. And no Eccho already | 
known, returneth ina very narrow room. 7 oe. eae 
The Natural Eccho’s are made upon Walls, Woods, Rocks, Hills, and | _ 
Banks: As for Waters being near, they make a Concurrent Eccho; but}. 
being further off, (as upona large River) they make an Interant Eccho: |} 
Forthere is no difference betweenthe Concurrent Eccho, and the Iterant, | 
but the quicknefs or flownefs of the return. But there is no doubt, but Wa- } 
ter doth help the Delation of Eccho, as well as ithelpeth the Delation of | 
Original Sounds. zal : | oe oe 
It is certain (as hath been formerly touched,) that if youfpeakthorow | 
a Trunck, itopped at the further end, you fhall finde ablaft return upon your | 
mouth, butnofoundat all. The caufeis, for that the clofenels, which pre- | 
ferveth the original, is notableto preferve the refle&edfound ; befides that, | 
Eccho’s are feldom created, but byloud Sounds. And therefore there is 
lefs hope of Artificial Eccho’sin Air, pentinanarrowconcave. Neverthe-] 
deep, and fpeaking , though but foftly, (yet not fo foft as a whifper) the | 
Water returned a good audible Eccho.: Itwouldbetryed, wvborhoe felted 
in Caves, where thereis noiflue.fave where you fpeak, willnot yield Ke | 
as Wells do. « EER oe Br 
The Eccho cometh as the Original Sound doth ina round orb of A 
It were good to trysthe creating of the Eccho’ where the Bodyrepercu 
maketh an Angle: As againft the Returnof a Wall, &c. Alfo we fe 
in Mirrors, there is the like Angle of Incidence, from the Obje& to : 
Glafs, and fromthe Glafs to the Eye. Andif you ftrikea Ball declan 
full upon the Surface, the rebound will be as much the contrary way ; -w 
2 : : ar : P 
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