Coinstantial

The sounds grew louder and louder, passing from one side of the room to the other with increasing celerity, and seemingly coinstantial, until the horn banged and jarred every-where within six feet of the medium, and about two feet from the circle, making almost a continuous dinning racket for a minute or two.

In Figure 9.2, Q is settled true at m₀ and m₁, and settled false at m₂, all of which are coinstantial.