SIREN. This, though not strictly a musical instrument, has rendered such good service to acoustical science that it deserves brief notice: for fuller details the works referred to below must be consulted. ‘It consists essentially,
’ says the most recent writer on mathematical acoustics,Lord Rayleigh, Theory of Sound, vol. i. p. 5. ‘of a stiff disc, capable of revolving about its centre, and pierced with one or more sets of holes arranged at equal intervals round the circumference of...
