Abstract: An apparatus and method for measuring the vertical motion of a floating platform e.g. a survey vessel, caused by wave action. The apparatus includes a sensor having three accelerometers (11,12,13) arranged on mutually perpendicular axes (Ax,Ay,Az) so that one accelerometer acts in a vertical plane and the other two act in a horizontal plane. Output signals (S1,S2,S3) from the accelerometers are continually sampled through a multiplexer (14) and are passed through an ADC (19) and a shift register (21) to provide output signals for a data processor (D) which provides a signal A indicative of the vertical position of the platform. In the method, the accelerometer output signals (S1,S2,S3) are corrected for offsets by use of a reference signal (So) and the corrected signals are used to derive the signal (A) which may be double integrated to obtain the final signal (A3) relating to vertical displacement.

Abstract: A method and apparatus for constructing an orthodontic applicance. The method includes the forming of a model of a patient's malocclusion. The teeth are separated and teeth are placed back in their malooclusion position on a base support. The teeth are moved directly from the malocclusion position to the prescribed ideal form. A tool is provided which can assist in establishing the arch form, placing the brackets on the model teeth in accordance with the desired arch form and determining the wire arch form.

Abstract: An orthodontic bracket and method of making same wherein the bracket has at least one tiewing integrally formed with a base portion. In one form of the invention the bracket is provbided with at least one longitudinally extending groove which extends into the base portion, the groove having at least a portion extending beyond at least a portion of the groove opening. In another aspect of the present invention is directed to a method of making an orthodontic bracket using ultrasonic machining techniques.

Abstract: An orthodontic bracket and method of making same wherein the bracket has at least one tiewing integrally formed with a base portion. In one form of the invention the bracket is provided with at least one longitudinally extending groove which extends into the base portion, the groove having at least a portion extending beyond at least a portion of the groove opening. In another aspect of the present invention is directed to a method of making an orthodontic bracket using ultrasonic machining techniques.

Abstract: An orthodontic bracket and method of making same wherein the bracket has at least one tiewing integrally formed with a base portion. In one form of the invention the bracket is provided with at least one longitudinally extending groove which extends into the base portion, the groove having at least a portion extending beyond at a least a portion of the groove opening. In another aspect of the present invention is directed to a method of making an orthodontic bracket using ultrasonic machining techniques.

Abstract: A hand tool for use in placing deck boards on a support structure which is in the form of a unitized main body portion which comprises at least one substantially vertically extending blade having an outer exposed edge, the blade being suitable for placement between adjacent deck boards so as to maintain a uniform space prior to permanently fixing the deck boards in place, a pair of substantially generally horizontally extending stabilizing arms extending from and integral with opposite sides of the base of the blade.

Abstract: A device for dispensing elastomeric orthodontic appliances. The device has a mounting section having a rigid support structure and an outer layer. The outer layer has integrally formed therewith a plurality of orthodontic appliances detachably connected thereto. The outer layer and appliances are made of a material having a stiffness substantially less than that of the support structure. The device also has a finger gripping section attached at one end of the mounting section and preferably made integral with the rigid support structure.

Abstract: The web-locker retractor has a pair of identical clamping wedges having teeth which are shaped to penetrate the material of a seat belt in order to displace the fibres of the material and engage therewith. Upon an engagement with the belt, the teeth interfit with those of one wedge fitting between those of the other. The teeth are arranged in arrays one of which is an offset mirror image of the other. The teeth of the two arrays are inclined oppositely to the direction of belt protection. Posts and sockets on the wedges co-operate to restrain the wedges to move perpendicularly to the belt plane, against a biasing spring. Upon locking, the web locker does not deflect the belt and therefore does not have to overcome a component of the tensile load on the belt. A retractor of light construction is therefore possible.

Abstract: An elastomeric orthodontic tensioning device having improved stain resistance qualities.

Abstract: A bookmark of molded plastic material is formed with a base having a retaining finger for clamping to a portion of the book. A retaining arm is integrally formed with the base and consists of a first horizontal section which extends along the width of the base, an intermediate section extending from the end of the first section at an angle toward the pages of the book, and a retaining vertical section extending from the end of the intermediate section and angled back toward the base and in the direction of the clamped portion of the book. The first and intermediate sections being in the same plane as the base.

Abstract: A bookmarker for use with a book comprising a substantially flat rigid support structure having a first end and a second end. A retaining spring for marking a place in the book is secured to one end of the rigid support structure and comprising a generally horizontal section and a generally vertical section which extends into the book for placement against the pages of the book.

Abstract: Masking films, having the advantageous properties of both those masking films having an intermediate adhesive layer and those masking films having a high-adhesion masking layer without an intermediate adhesive layer, include a masking layer which incorporates a cellulose ester component, a polyurethane and one or more colorants selected from dyes and pigments.

Abstract: A centrifuge tube assembly comprising a centrifuge tube and an inserter for placement within the neck portion of the centrifuge tube. The insert has a rigid portion and pliable portion.

Abstract: A rain guard for use with a triple track storm window. The rain guard comprises a generally rectangular body made of a plastic material having top edge, bottom edge and a pair of vertical edges. The body has top flange along its top edge, a pair of vertical flanges along its vertical edges and a dome section extending from the flanges to the bottom edge. The body is designed such that the vertical flanges will fit within one of the tracks of a triple track storm window.

Abstract: A pallet base for a corrugated board case comprises a tray having a flat central zone and a foldable margin which, when folded from a flat state to an erect state, defines peripheral feet which incorporate flaps which can be folded inwards to overlie the central zone and thereby maintain peripheral tray flaps of the pallet base in an erect position. The inwardly foldable flaps may be held turned in through at least 90.degree. by elastic bands which are readily removable to return the base to a fully flat condition.

Abstract: A plastic container for hoding an array of vials or other like articles. The container has a base potion and a top cover for placement thereon. The base portion is provided a divider defining a plurality of openings for receiving and maintaining in position a plurality of vials or other like artivles. The divider is provided with indica for identifying the position of the vials.

Abstract: A container and cap assembly comprising a receiving container and a cap for engagement therewith. Engagement means is provided for quick assembly or disassembly of the cap from the container which comprises at least two recesses in the cylindrical outer wall of the lower end of the cap for receiving corresponding locking pins on the cylindrical wall of the container. The recesses each comprise a first receiving portion and a locking portion. The locking pins each have a substantially elongated outer configuration with respect to longitudinal axis of the container.

Abstract: A pair of skis suitable for both slalom and giant slalom ski racing. This is achieved by providing a pair of skis so that corresponding inside edges have the same sidecut. Each of the outside edges of the skis may have the same sidecut as the other, but different from the sidecut of the inside edges. When the skis are reversed, the outside edges become the inside edges, and the inside edges become the outside edges, either changing the skis' suitability from giant slalom or slalom, or from slalom to giant slalom. Stiffening plates can be attached to the skis to provide rigidity and stability required by the skis for giant slalom racing and removed for slalom racing.