Abstract: An apparatus and technique that extend the useful weighing range of a weight scale is provided. A preferred embodiment comprises a screw and a moveable weight. A head of the screw fits into a notch on the weight scale and the location moveable weight is varied in relation to the screw head by driving the screw into or away from the center of the moveable weight via a tapped receiver of the moveable weight. In a second embodiment, a supplemental weight has a base and a movable weight that are associated and positionally adjustable along at least one linear axis. In a preferred embodiment, a threaded screw length is used to adjust the relative positions of the base and the movable weight. The supplemental weight is removably coupled with the weight scale and calibrated into an operating state, wherefrom the weighing range of the scale may be extended.

Abstract: A combination rule and scale is disclosed in which the weight of the rule is used to counterbalance the weight of an object, such as a letter, and provide a measurement of the object's weight. In one embodiment the combination rule and scale comprises a coilable tape rule having both linear and weight gradations thereon. The rule's case is adapted to be supported in a suspended condition in alignment with its center of gravity and includes a clamp device for supporting an object to be weighed on the casing. By extending the tape rule on the side of the tape opposite the support device, the casing can be balanced and the weight of the object determined.

Abstract: A weighing apparatus has a closed chamber of variable volume adapted to receive a load. An upright tube has an upper end open to the atmosphere and a lower end connected via a conduit to the chamber for fluid communication therebetween. This conduit has a first section of relatively small diameter connected between the upper end of a large-diameter reservoir and a second narrow-diameter section connecting the lower end of the reservoir with the lower end of the tube. A first liquid of relatively light density completely fills the chamber, the first section of the tube, and the upper portion of the reservoir. A second liquid of relatively heavy density completely fills the second section of the conduit, the rest of the reservoir, and a portion of the tube. Thus compression of the closed chamber will move the surface level of the second relatively heavy liquid upwardly in the tube.