. . . . "an acoustic radiometer consisting of a light disk suspended from a quartz thread; when exposed to a progressive sound wave its torque can measure velocity"@en-us . . "103214804"@en-us . "Rayleigh disk"@en-us . "0"^^ . . . "04056718-n"^^ . "104056718"^^ . . "Rayleigh disk"^^ . . "0"^^ . "103903995"@en-us .