upon or into the other, either directly or obliquely, one Object shall appear many; as in Sir Samuel Moreland's Glass-room: After the same manner Ecchoing Bodies may be so contriv'd and plac'd, as that reflecting the Sound from one to the other, either directly and mutually, or obliquely and by Succession, out of one Sound shall many Ecchoes be begotten; which in the first case will be all together, and somewhat involv'd or swallow'd up of each other, and thereby confus'd (as a Face in Looking-glasses obverted) in the other they will be distinct, separate, and succeeding one another; as most multiple Ecchoes do.
Moreover a Multiple-Eccho may be made, by so placing the Ecchoing Bodies, at unequal distances, that they reflect all one way, and not one on the other; by which means a manifold successive Sound will be heard (not without astonishment) one Clap of the hands like many, one Ha, like a laughter, one single Word like many of the same Tone and Accent, and so one Viol like many of the same kind imitating each other.
Furthermore, as Specula's may be so order'd, that by Reflection they shall make one single thing appear many different things; as one single Man to seem many Men, differing as to Shape and Complexion (or a company of Men) which I think Sir Samuel Moreland's Contrivance does not: So may Ecchoing Bodies also be order'd, that from any one Sound given, they shall produce many Ecchoes, different both as to their Tone and Intension. (The ground whereof has elsewhere been laid down in a Treatise concerning the Sympathy of Lute-strings.)
By this means a Musical Room may be so contriv'd, that not only one Instrument, play'd on in it shall seem many of the same sort and size ; but even a Consort of (somewhat) different ones; only by placing certain Ecchoing Bodies so, as that any Note (play'd) shall be return'd by them in 3 ds , 5 ths , and 8 ths , which is