UNDULATORY a.
e place, not in the direction of propagation, as in the air waves constituting sound, but transversely, and the various phenomena of refraction, polarization, interference, etc., are attributable to the different affections of these undulations in different circumstances of propagation. It is computed that the frequenc…
WHEEL n.
), a tree (Aspidosperma excelsum) of Guiana, which has a trunk so curiously fluted that a transverse section resembles the hub and spokes of a coarsely made wheel. See Paddlewood. -- Wheel urchin (Zoöl.), any sea urchin of the genus Rotula having a round, flat shell. -- Wheel window (Arch.), a circular window having…