For if the Medium be Thin and Quiescent, and the Sounding Body plac'd conveniently, the Sound will be easily and regularly propagated, and mightily conserv'd. I say,
- If the Medium be Thin and Quiescent, because it otherwise causes a Refracted Sound, of which afterwards. Hence in a still Evening, or the dead of the Night (when the Wind ceases) a Sound is better sent out, and to a greater distance than otherwise, tho' much of this may be ascrib'd to its Refraction also.
- I say, that the Sonorous Body must be plac'd conveniently, near a Smooth Wall, near Water, or a Plain, whose Surface is even.
- Near a Smooth Wall, either Plain or Arch'd (Cycloidically or Elliptically, rather than otherwise, tho' a Circular or any Arch will do, but not so well.)
Hence in a Church, the nearer the Preacher stands to the Wall (and certainly 'tis much the best way to place Pulpits near the Wall) the