Other

Antonino E Correlli

John W Grant

A method of improving the 'tight space' usefulness of a unidirectional microphone of the type having an otherwise screw-together headpiece and handle, includes the steps of: (a) fabricating an adapter having male- and female-threaded ends and a cavity of a specified volume that extends between these ends, and where each of these ends has a centerline and these intersect at a prescribed angle, (b) fabricating the adapter's cavity so that its volume is approximately equivalent to that of the volume of handle's acoustic chamber, and (c) connecting the adapter's male-threaded end to the handle and its female-threaded end to the headpiece in such a manner as to not appreciably change the frequency response characteristics of the microphone.

Microphone adaptor for altering the geometry of a microphone without altering its frequency response characteristics

A hand-operated sheet metal layout and marking tool supports sheet metal on a base where it may be laterally guided by a fence adapted for use at either side of the sheet metal, and permanently marks location of bend lines to be made, by means of a die-head carrying a row of pointed dies and pivotal for simultaneously impinging the dies against the sheet metal. The base has a recess along it in alignment with the row of dies to permit the sheet metal to yield for easier indenting. Spacing between the dies is easily set by means of a scale fixed on the base, and a die carrier ring carrying each die, that slides along a grooved rod coaxial with the similar rings carrying the other dies and can be fixed in position by a set screw that rides in the rod groove. When desired, any die can be swung out of operation, and all can be swung together by rotating the rod.

Growing community of inventors

Baltimore, MD, United States of America

Antonino E Correlli