Abstract: Left and Right side view mirrors for a vehicle giving the driver a view outwardly to each side of the vehicle, to check lanes on each side, to ensure safe lane changes.

Abstract: Left and Right side view mirrors for a vehicle giving the driver a view outwardly to each side of the vehicle, to check lanes on each side, to ensure safe lane changes.

Abstract: A liquid conductivity measuring circuit with power-save features is described for use with a four electrode conductivity cell having two potential electrodes and two current electrodes positioned in the cell in spaced relation in a particular sequence with a first operational amplifier having its output connected and its inputs connected via an isolating capacitor and a buffer amplifier and a voltage setting resistance to a source of square-wave voltage, a second operational amplifier having its inputs connected to ground and via an isolating capacitor and its output connected to a reference resistance such as to control the current through the reference resistor to maintain one electrode at a constant potential, readout means being adapted to measure, on initiation of a single or small number of square-wave voltage cycles in a period short enough that no significant change of polarization of the potential electrodes can occur, the voltage between the positive and the negative half cycles or the change from z

Abstract: The salinometer is based on a direct determination of the conductivity ratio R.sub.t =(Cx/Cs).sub.t of sample water to standard seawater in a two channel, dual-cell, continuous-flow system. Each of the channels includes a conductivity cell with four electrodes immersed in sequence in the water flow. Two of the electrodes are current electrodes and the other two electrodes are potential electrodes. The standard water and the sample water pumped into their respective channels, are maintained at a common temperature by heat exchangers and a common bath. The salinometer circuitry include a first current source for driving a controlled current into the current electrodes of the conductivity cell to maintain a constant voltage across the potential electrodes. A second current source drives a current which is a linear function of the first controlled current into the current electrodes of the conductivity cell in the reference channel. The conductivity ratio R.sub.

Abstract: A barometer of the evaporation or hypsometer type comprising an enclosed cylindrical bulb partially filled with a working fluid, a first temperature measuring device positioned in the bulb for measuring the temperature of the working fluid therein, a relatively thin extended tube connected to and extending upward from the bulb, a second temperature measuring device positioned on the tube at a position away from the bulb for measuring the temperature of the working fluid at that location, an electrical heater associated with the bulb for bringing the working fluid to the evaporation temperature, a mechanism for transmitting ambient pressure to the inside of the tube-bulb combination and preventing escape of working fluid connected to the upper end of the tube, electrical means connected to the heater for providing a heating current thereto, control means connected to the second temperature measuring device and the electrical means for controlling the level of heating current provided to the heater, and output

Abstract: Apparatus for measuring barometric pressure comprising a housing made of high thermal conductivity metal and defining a cavity therein, a diaphragm of flexible spring type material clamped in position across the cavity dividing it into upper and lower portions, a connecting passage leading from the lower portion of the cavity to the pressure to be measured, electrical means for measuring deflections of the diaphragm and providing a control signal to a power supply, a low boiling point liquid filling part of the upper portion of the cavity in the housing, with vapor from the liquid filing the remaining part, a heating coil positioned in relation to the housing and connected to the power supply controlled by the electrical means such as to bring the temperature of the liquid and thus its vapor pressure to a level to balance the pressures across the diaphragm, thermal insulation encompassing the housing and means for measuring the temperature of the housing and the liquid therein, this temperature being related

Abstract: A salinometer apparatus for measuring the salinity (conductivity) of a liquid sample from a standard sample bottle or other container having an elongated tube having one end adapted for insertion into a sample bottle or container, a conductivity measuring cell formed of a glass tube having an elongated main body portion, four upwardly extending branch tubes connected to the main tube and having liquid seals at their upper ends, metal electrodes mounted inside the four branch tubes, two of the electrodes forming potential electrodes and the other two forming current electrodes, electrical leads passing through the seals and connected to the four electrodes, said cell being connected at one end to the elongated tube and the other to waste, a temperature controlled liquid bath, temperature changing means associated with said bath, an electric heating and control circuit connected to said heating means, the said conductivity cell and a portion of the elongated tube being immersed in said bath, means for flushing