Abstract: A tennis player needs multiple playing racquets available for their use, and the mass proportions of every racquet in their bag needs to match, otherwise players will likely experience a degradation of their swing mechanics, BOC provides an accurate measurement of player racquets mass proportions by comparator testing of any 2 racquets, thus providing a simplified solution for accurate measurement, and then equalization process of player racquets mass proportions.

Abstract: The invention—Ayurvedic Scale—is a machine that physically represents or models the philosophical essence of the ancient science and philosophy of Ayurveda in the form of a tri-armed scale. The Ayurvedic Scale's primary function is to assist users in determining and visually representing their current spiritual state as well as their underlying Ayurvedic body type, which are both helpful in evaluating immediate choices using Ayurvedic philosophy. It also serves to act as a visual model in helping users to more clearly understand the complexities of Ayurveda, to provide a physical reminder of Ayurveda's suggested foci in the user's life, and to act as a decorative model, which reflects the owner's interest in Ayurveda. The invention is meant to embody two of Ayurveda's core foci—simplicity and balance.

Abstract: A portable postal scale for determining whether the weight of a letter exceeds the maximum for a given amount of postage, for example, one ounce. The scale comprises an elongated beam having a letter holder, a fulcrum, a leveling assembly and a preloaded portion and a wedge shaped piece. The letter holder comprises two upward facing arms forming a narrow slot for holding the letter to be weighed in an upright position. The leveling assembly, which allows the scale to be used on an unlevel surface, comprises a leveling bubble with scribe lines. The portion of the beam from the fulcrum to the end opposite the letter holder is the preloaded portion that has sufficient weight to balance the beam when a letter of predetermined weight is placed in the letter holding slot. In use, the end of the beam opposite the letter holder is placed on top of the wedge shaped piece, which is moved forward or backward until the leveling assembly is level.

Abstract: A four-pan algebra balance includes an imbalance correction mechanism for maintaining a balance beam in a horizontal equilibrium position unless the imbalance between the two sides of the device exceeds a predetermined amount. The balance includes a base, an upright stand mounted to, and extending substantially vertically from the base, a crossbar mounted to an upper end of the stand so as to extend substantially horizontally and the balance beam pivotally coupled to a midpoint of the stand. A first weight receptacle subassembly including two pans is coupled to a first end of the crossbar and a first end of the balance beam and a second weight receptacle subassembly including two pans is coupled to a second end of the crossbar and a second end of the balance beam. A visual indicator provides an indication of the relative equality of the first and second weight receptacle subassemblies.

Abstract: A portable postal scale for determining whether the weight of a letter exceeds the maximum for a given amount of postage, for example, one ounce. The scale comprises an elongated beam having a letter holding means, a fulcrum and a preloaded portion. The letter holding means comprises two upward facing arms forming a narrow opening or slot for holding the letter to be weighed in an upright position. The part of the beam from the fulcrum to the end opposite the letter holding means is the preloaded portion; the preloaded portion has sufficient weight to balance the beam when a letter of predetermined weight is placed in the slot. A calibration means for the beam and longitudinally located recesses made suitable to accept a movable counterweight for determining additional increments of weight are provided in other embodiments.

Abstract: A letter weighing device has a slidable fulcrum to indicate the exact weight of a letter or the like being weighed. The letter weighing device has an elongate member having upper and lower elongate surfaces, the upper elongate surface supporting two spaced apart and substantially parallel resilient ribs extending longitudinally along the elongate member so as to define a recess therebetween. Further, at least a portion of each rib extends in a direction generally toward the other rib. A fulcrum member is mounted upon the upper surface so as to be moveable along the length of the elongate member. The fulcrum member supports the elongate member from above. Additionally, a parallel pair of ribs define a recess therebetween in which additional items can be stored.

Abstract: A balance for teaching arithmetic principles has a balance arm pivotal about a central horizontal pivot axis coincident with the axis of a support rod supported in openings at the top of opposed vertical upstanding members of a support. The balance arm has a central rectangular housing and end rectangular housings at each end extending upward carrying vertical calibrations at intervals corresponding to the height of annular washers that balance the arm. A number of upstanding vertical pins similarly vertically calibrated are spaced at one-inch intervals on either side of the pivot axis at horizontal locations on the arm along respective horizontal calibration indicia of diameter corresponding substantially to the diameter of the central openings in the washers. The front face of the balance arm is transparent along its length for exposing scales on a central mandrel carrying a number of scales that may be rotated to expose a selected scale.

Abstract: Apparatus for quickly comparing the weights of fish and quickly determining whether fish have sufficient length, comprising an elongated balance beam having fish stop means, fish attachment means and fish length indication means at each end of the beam, a handle rotatably secured to the beam at its longitudinal center of gravity and a bubble level indicator secured to the face of the beam.

Abstract: The microbalance includes a mounting having two vertically aligned elongated flexible metal tension members, the upper and lower ends of the tension members being attached to a fixed support. The attachment of one end of each of the tension members to the fixed support is carried out by a resilient tension means. A pivot crossbeam is fixedly attached to the balance beam, and the ends of the pivot beam are fixedly attached respectively to the tension members at points intermediate to the ends. Deflection of the microbalance beam is accommodated by flexure of the metal tension members.

Abstract: A balance beam teaching aid illustrates and verifies mathematical operations involving both integer and non-integer numbers. The balance beam includes a base, a balance arm having a center of gravity and graduations disposed on a face at predetermined longitudinally spaced intervals and a suspension system for pivotably suspending the balance arm from the base to permit rotation of the balance arm in the vertical plane and for preventing rotation of the balance arm in the horizontal plane. Substantially two dimensional area-weights formed from a uniform density, uniform thickness material are attached to the balance arm by inserting the area-weights into a pressure-closed slot disposed in a face of the balance arm and extending along the entire length thereof. The area-weights are typically cut from sections of relatively heavy paper which has a rectangular grid imprinted thereon.

Abstract: A thermobalance wherein fulcra are provided respectively at the tips of both arms in a main balance, auxiliary balances are suspended respectively on said fulcra, one arm of the above mentioned auxiliary balance is extended near to a vertical line passing through the fulcrum of the main balance and a sample and standard sample are suspended on the tips of the respective arms and are arranged in the same furnace.