A pulse switched digital multiplier for matching transfer characteristics of digital processes having a plurality of pulse switch positions, and a pulse switch setting circuit which, under the control of a setting code from a setting program, sets the pulse switch to a given one of the pulse switch positions. Each switch position corresponds to a discrete digital multiplication performed by one of a plurality of discrete multiplication coefficients forming part of the discrete number set 2.sup.m...

A method and a device for rock-drilling and/or earth boring of a number of drill-holes to a predetermined bottom surface are disclosed in which a reference surface defined by electro-magnetic radiation is generated parallel to the bottom surface, the distance between the reference surface and the point at which drilling is to be initiated is measured in a direction common to all holes, the penetration of the drill-rod into the ground is added to said distance, and drilling is interrupted when th...

A comparator combines unbalanced differential input amplifiers to produce a balanced input stage that forces the comparator output to a predetermined state whenever the first differential amplifier enters dropout. The comparator's second differential amplifier is imbalanced to overcome the variable offset voltage which creates the comparator's hysteresis voltage. Its first differential amplifier is imbalanced to compensate for the imbalance of the second amplifier, thereby producing an input sta...

A thin film membrane formed to a predetermined shape is produced by bending the membrane to create a loop and softening the membrane that makes up the loop with either thermal energy or a swelling solvent. The softened loop is then drawn between plates or about a mandrel to form a membrane with a predetermined fold radius. The fold region produced by the method of the instant invention does not require an adhesive sealant to prevent unfiltered liquid from diffusing through the membrane. The meth...

A fishing bobber is disclosed wherein a passageway is provided in the housing of the fishing bobber to a centerline so as to permit the fishing bobber to be releasably provided on an intermediate section of the fishing line. The fishing bobber is freely received by the fishing line at the centerline of the fishing bobber. An obstruction such as a section of tubing is positioned at a preselected position of the fishing line so as to prevent movement of the fishing bobber beyond the obstruction. I...

A loading device including a frame, a stopper provided along the path through which the products are fed to the predetermined location, a threaded column supported in the frame and rotating in such a manner that the upper surfaces of the threads thereof move clockwise in a direction toward the stopper, a motor rotating the threaded column, and a conveyer supplying the product to the threaded column in such a manner that the product is engaged with the portion between the screw threads. The threa...

Methods are disclosed for scaling and calibrating predetermined signals in apparatus for measuring and displaying predetermined characteristics of reciprocating machines. In the preferred embodiment, the methods comprise the calibrating of a pressure data acquisition and scaling system to eliminate inaccuracies due to temperature related changes in component values due to such things as component aging, the scaling of an amplified signal from a pressure transducer suitable for display purposes a...

An apparatus for cutting metallic tubing into predetermined lengths has a stationary supporting frame on which is mounted a feeding mechanism for moving a straight length of tubing unidirectionally intermittently along a straight path in alignment with the longitudinal axis of the tubing. A cutoff device driven by a motor having a hollow shaft for receiving the tubing is also mounted on the frame. The feeding mechanism is in two sections each being individually reciprocable but controlled to ope...

A lift control system includes a spatial filter for producing a signal having various features, a discriminator for discriminating one or more features of the signal, and for producing a control signal when at least one of the features discriminated falls in a predetermined range, and active devices connected to the discriminator. The spatial filter is defined by a semi-spherical bowl having a plurality of openings or by a poly-face prism which is made from a plano-convex lens with its curved fa...

A pulse delay circuit has two gate circuits cooperating with two resistance-capacitance units, one of which controls the delay interval and the other of which controls the width of the output pulse.