they may be imploy'd in the Day-time, as well as Perspectives, whence they may (not unfitly) be term'd the most useful Instrument of the two.
- As Microscopes or Magnifying-Glasses help the Eye to see near Objects, that by reason of their smallness were Invisible before; which Objects they Magnify to a strange greatness: So Microphones or Micracousticks, that is Magnifying Ear Instruments, may be contriv'd after that manner, that they shall render the most minute Sound in nature distinctly audible, by Magnifying it to an unconceivable loudness.
By the help hereof we may hear the different Cries and Tones, as well as by Microscopes see the divers Shapes and Figures of the smallest Animals.
- As by Polyscopes or Multiplying-Glasses, one thing is represented to the Eye as many, whether in the same or different Shapes (for so Multiplying-Glasses may be contriv'd:) So by a Polyphone or Polyacoustick well order'd, one Sound may be heard as many, either of the same or a different Note. Insomuch, that who uses