Abstract: The present invention relates to a fixed-fixed membrane for a microelectromechanical system (MEMS) microphone. In one embodiment, a MEMS acoustic sensor includes a substrate; a membrane situated parallel to the substrate; and at least one vent formed into the membrane, wherein the at least one vent is a curved opening in the membrane, and wherein the at least one vent is disposed substantially along a length of the membrane.

Abstract: Apparatus 10 for measuring the head of a horse 12 incorporates various components, such as cheek straps 14, each of which is movable (slidable) relative to another component in order to produce an overall desired fit of the apparatus 10, which is generally in the form of a bridle, to the head 12. Once the desired fit has been achieved, windows 16 and numerals 18 allow measurements to be taken, indicating the relative positions of the slidable components. These measurements may give direct measurements of the lengths required of various components of the bridle to be made, or may be other measurements from which strap lengths can be deduced. The apparatus 10 generally resembles the bridle which will be constructed, and thus allows the user to ensure a good fit to a particular head (which is partly an aesthetic judgement, and partly based on measurement and experience), so that a bridle can then be made with reasonable confidence that it will be a good fit.