Abstract: An ink jet apparatus having a scanning head employing at least one ink jet with a variable volume chamber which includes an ink droplet ejecting orifice, and a transducer, having a length mode resonant frequency, adapted to expand and contract along an axis of elongation in response to an electric field substantially transverse to the axis of elongation for ejection of droplets on demand from the ink droplet ejecting orifice is acoustically microstreamed by exciting the transducers during non-printing periods to eliminate start-up problems and to maintain pigments or other particles in dispersion within the ink.

Abstract: An ink jet apparatus has a manifold and a feed tube of substantially the same cross-sectional areas as the manifold, thereby connecting the manifold with an ink reservoir so as to effectively present the large compliance characteristic of the reservoir at the manifold, and enabling a reduced volume print head construction which efficiently reduces cross talk and vibrational problems.

Abstract: A method and apparatus for supplying ink to an array of ink jets is provided by two fluidically independent reservoirs, each reservoir supplying ink to a respective end of a manifold which communicates with the array of ink jets via their inlet restrictors. During normal operations involving an acceleration of the array along a scanning path, the ink levels in the two reservoirs will remain the same since any difference in their levels will create a pressure differential that drives a flow of ink through the manifold from the higher level reservoir until such time that their levels equalize.

Abstract: A device for measuring and indicating changes in the resistance of a living body including an analog portion, a digital portion and a source of power for supplying stable power to the analog and digital portions. The analog portion includes a bridge network which includes a potentiometer for setting a reference level for the device. The digital portion includes a potentiometer which turns together with the potentiometer provided in the analog portion and digital processing circuitry and digital displays for determining and displaying a count indicative of the position of the potentiometer and the total amount of rotation of said potentiometer. In addition, a computer could be interfaced with the device to record or play back the changes in the resistance of the living body.

Abstract: In accordance with the invention there is provided an electrical resistance measuring indicating device including a bridge network having on one side thereof a first resistance arm connected to a second resistance arm and on the other side thereof, first voltage arm connected to a second voltage arm, there being between the junction of the first and second resistance arms and the junction of the first and second arms are transisterized amplifier circuit and an undamped indicating means responsive to changes in the balance of the bridge networks so as to indicate or measure the resistance or variation in resistance of a subject such as a body are part connected to the network across one of the resistance arms. The indicating means includes a moving coil meter which includes a metal frame of zero conductivity having a meter coil wound thereon and an indicating needle coupled to the frame.

Abstract: A compliant, hydrodynamic fluid film bearing for supporting a rotating rotor on a stationary mount, includes a bearing sheet supported by a compliant resilient support member formed of two sheets, each having raised resilient elevations in the form of corrugations. One of these sheets is inverted with respect to the other and the corrugations on the two sheets are vertically aligned and face in opposite directions, each corrugation forming one-half of an elongated tubular spring. A metal sheet lies between the two support sheets and all three sheets, and the bearing sheet, are fastened at one end to a pair of spacer blocks. The yield strength of the support member is thus raised above the yield strength of a single support sheet while maintaining low stiffness.