Abstract: An attachment for a bench grinder having at least one grinding surface, a tool rest fastener and a tool rest is described. The attachment includes a tool-receiving plate having a bottom surface and a top surface. The bottom surface is configured to matingly engage the tool rest surface. The top surface includes one of a flat surface and a surface having an angled V-shaped groove that is shaped and configured to receive a drill bit or and hold it at a fixed elevation and angle relative to the grinding surface. A slotted flange is normally attached to the tool-receiving plate, is configured to engage the slot with the tool rest fastener while the tool-receiving plate rests on the tool rest surface, and to abut the flange against the attachment surface to hold the attachment immobile during use.

Abstract: An apparatus for splitting solid and hollow masonry materials is provided. The apparatus includes changeable support tables and upper splitting blades to accommodate various types of masonry materials. A hydraulic ram is operated via a foot pedal to increase the pressure in the ram to raise a lower cutting blade and spring-loaded support table to exert upward and downward pressure on the material, coming it to clearly split. The upper blade is height-adjustable and the support table can be fixed in a lowered position to facilitate the splitting process by eliminating overly repetitive operation of the hydraulic ram.

Abstract: An attachment for a bench grinder having at least one grinding surface, a tool rest fastener and a tool rest is described. The attachment includes a tool-receiving plate having a bottom surface and a top surface. The bottom surface is configured to matingly engage the tool rest surface. The top surface includes one of a flat surface and a surface having an angled V-shaped groove that is shaped and configured to receive a drill bit or and hold it at a fixed elevation and angle relative to the grinding surface. A slotted flange is normally attached to the tool-receiving plate, is configured to engage the slot with the tool rest fastener while the tool-receiving plate rests on the tool rest surface, and to abut the flange against the attachment surface to hold the attachment immobile during use.

Abstract: An apparatus for splitting solid and hollow masonry materials is provided. The apparatus includes changeable support tables and upper splitting blades to accommodate various types of masonry materials. A hydraulic ram is operated via a foot pedal to increase the pressure in the ram to raise a lower cutting blade and spring-loaded support table to exert upward and downward pressure on the material, coming it to clearly split. The upper blade is height-adjustable and the support table can be fixed in a lowered position to facilitate the splitting process by eliminating overly repetitive operation of the hydraulic ram.

Abstract: Stored digital terrain data are used as a parameter for a passive ranging exteded Kalman filter in a target range measurement system. The system accurately locates ground based targets using platform referenced passive sensors. The Kalman filter algorithm fuses angular target measurements (azimuth and elevation) from available sensors (FLIR, RFR, etc.) along with stored digital terrain data to obtain recursive least-square error estimates of target location. An iterative algorithm calculates the slant range to the intersection of the target's line of sight vector with the digital terrain data base. This calculated slant range is used as an input to the Kalman filter to complement the measured azimuth and elevation inputs. The Kalman filter uses the calculated range measurement to update the target location estimate as a function of terrain slope. The system arrives at a rapid solution by using the stored digital terrain data to provide estimates of range.

Abstract: A drift correction mechanism for a vehicle (e.g. aircraft) navigation system makes use of a digital map data base, in order to correct for errors in position estimates, so that the estimated flight path of the aircraft will more closely track its actual flight path, and thereby effectively compensate for the long term error to which the navigation system is subjected. During the flight, altimeter readings are periodically carried out in order to generate elevation values that are representative of the actual elevation of the terrain over which the aircraft is flying. These elevation values are then used as inputs to a digital map database, from which elevation profile contour lines of respective elevation values may be derived. At the time that a respective altimeter reading is effected, the position estimate output of the aircraft's navigation system is also sampled.

Abstract: A navigation system contains a modified Kalman filter processor which continuously receives both TERCOM and SITAN control information so that the operation of the SITAN processing is effectively continuously optimized. The system employs an over flight terrain data storage map to which position and altitude signals are coupled for extracting both elevation and slope information from the stored map. The extracted elevation and slope data are coupled, together with the outputs of baromatic and radar altimeter sensors and estimated altitude and position data outputs from the navigation unit, to a correlation/modified Kalman filter processor.

Abstract: An adaptive interference reduction system for removing cross talk from a dual polarization system comprising a first adjustable filter for varying the phase and the weight of a first input signal, a second adjustable filter for varying the phase and the weight of a second input signal, a first adder for adding this first input signal and the weighted and phase adjusted output from the second adjustable filter, a second adder for adding the second input signal and the weighted and phase adjusted output from the first adjustable filter, a first noise-to-signal measuring device for generating a signal proportional to the noise-to-signal ratio in the output signal from the first adder, a second noise-to-signal measuring device for generating a signal proportional to the noise-to-signal ratio in the output signal from the second adder, and a dither-type control logic for dithering in-phase and quadrature square-waves in accordance with the signals generated by the first and second noise-to-signal measuring devices

Abstract: Apparatus for effecting and controlling the firing of energy sources, particularly is seismic work, includes means for automatically correcting the delays between the desired and actual firing times which may be different for different sources. These means comprise a number of programmable counters for initiating the firing of different sources, a reference time counter to indicate the desired firing time or times and comparator means responsive to differences between actual and desired firing times to cause the programmable counters to bring the actual firing times towards the desired firing times.

Abstract: A method for finding the position of a drill bit working at the bottom of a borehole comprising sending ultrasonic energy down the drill stem, recording the energy radiated from the drill bit through the earth to an array of geophones around the wellhead on the surface, and calculating the distance from the drill bit to each geophone. The drilling mud surrounding the drill stem absorbs the slight amount of ultrasonic energy that escapes laterally so that substantially all of the effective signal is generated at the bottom of the hole where the drill bit is working.

Abstract: A sonic generator sends a collimated acoustical wave into the section of earth under test and resonance conditions are established depending upon the nature and depth of discontinuities in the path of the acoustical wave. These resonance conditions are monitored by observing and recording electrical relationship in the power supply section of the sonic generator.