[48i] ^ 
So an Inftrument may be invented, that apply 'd to the 
Mouth ( or any Sonorous body ) (Iiall fend forth the voice 
diftindtly to as prodigious a diftance and loudnefs. 
For if the Stentoro'pbonecon[y]]\\c^\\^ but a rude and 
onartificial Inftrament. ) does fuch great feats ; what 
might be done with one compos'd according to the rules 
of Artr* v^\ioi^mahe ftiould comply with the Laws oi So- 
norous Motion ( which that does not ) and therefore not 
lb much HefraU, as to alter and confound the Tom of 
the Voice and words ( as that fomewhatdoes J 
Now of what ufe fach an Inftrument might be for 
fpeaking clearly and articulately at a diftance, ( and that 
without altering the Tone of the Voice ) whether it be at 
Sea or at Land ( but efpecially at Sea in tempeftuou^ wea- 
ther and in the night j is obvious to any mantocon- 
ceive. 
2. As Inftruments have been invented to help the £y^» 
So iikewife are there fome, and more fuch there may be^ 
for the Ear, 
F-or^- 
1 . As SpeHacles and other GlaJJes are made to help the 
Ftirblindznd weak Ey s, to fee at any competent diftance: 
So there ^vq OtacouJIicks and better may be made) to 
help weak^i^rj- to hear at a reafonable diftance alfo. Which 
woiiM be a . great a help to the infirmity of Old Age, as 
the other invexntion of Spedacles is, and perhaps greater,- 
forafmach as the Hearing what's Ipoken is of more daily 
ufe and concern to fuch men, then to be able to ^ad 
Books or to Fiero Figures. 
2. AsP rfpeBivi'GlajJes and Tele/copes help the Eye to 
fee Objeds ^at a very great diftance, which othervvife 
would not be difcernable; in like manner may a fort of 
Otacoufiic\s be fo contrived as that they fhall receive in 
Sounds made at a very great diftance alio but with fo 
much advantage, that the Ear ftiall be able to hear them, 
which otherwife would have been 
