is, the louder it will whistle cæteris paribus; I say, cæteris paribus, because, besides the strength and dryness of Winds or Breath, there are a great many other things (hereafter to be considered) that concur to the increase or magnifying of Sounds, begotten by them in an Instrument exposed to their Violence, or blown into.
- The third Problem, is, That a Sound may be convey'd from one extreme to the other (or from one distant place to another) so as not to be heard in the middle.
By the help of this Problem a Man may talk to his Friend at a very considerable distance, so that those in the middle space shall hear nothing of what passed betwixt them.
FIG. V. TAB. III.
Semiplanum Sphæræ Phonicæ seu Acousticæ.
You are to conceive that (rude) Semiplane , as parallel to the Horizon : For if it be perpendicular thereunto, I suppose the upper extremity will be no longer Circular , but Hyperbolical , and the lower part