(a) Reflections from a parabola; (b) reflections from a convex surface; (c) reflections from a plane surface (after Parkin and Humphreys, 1958)
Extract
(a) Reflections from a parabola; (b) reflections from a convex surface; (c) reflections from a plane surface (after Parkin and Humphreys, 1958)
Faber & Faber Ltd, London: after P.H. Parkin and H.R. Humphreys, Acoustics, Noise and Buildings (3/1969)