Abstract: An adjustable angle instrument for high precision craftsmanship is configured from a pair of similar metal sector parts, each having a sector shape with a wide double flange along a straight edge. The two sector parts are accurately pivoted together in an apex region. Each flange is made to have accurate surfaces on its outer surfaces on which the instrument may be stood in a vertical position or laid horizontally on a flat surface such as a saw table. The flanges may be set to any angle between 45 and 90 degrees as indicated by a calibratable hairline cursor, and the angle may be captured by locking the two sector parts together by tightening a knurled brass knob. One of the sector parts is also provided with an edge which is accurately machined at 90 degrees relative to the flange and thus may be set to any angle between 0 to 45 degrees relative to the other flange, providing the instrument with a total range of 0 to 90 degrees.

Abstract: There is disclosed a head loading carriage assembly for a data storage device such as a "floppy" disk device, the carriage assembly including a base and being movable in a radial direction relative to the recording medium. Pivoted with respect to this base are two arms: a head support arm carrying at least one magnetic head and an auxiliary load arm which is movable in respect to the head support arm between a first and a second load position. The magnetic head is in contact with the recording medium in both of these load positions; however, it is operative only in the first load position. A first spring urges the auxiliary load arm into the first load position towards the head support arm, so as to engage the magnetic head attached to this arm with the recording medium. A second spring, forming a residual leaf spring, is arranged between the head support arm and the auxiliary load arm.