[Letters to Editor]

Abstract

OF the many ingenious forms the microphone has taken—and I believe I am acquainted with most of them—none is, I think, more efficacious than the one I offer for your inspection. The jarring sound in the principal instruments in use, which, by vibration, may emanate from passing vehicles, &c., is entirely obviated, and the sound of a piece of fine silken thread, or the now well-known tramp of a fly, is heard with double the distinctness of any microphone I have listened to.