Abstract: An `in-line` unit for use in compressor station piping, arranged to reduce the level of noise generated when the blowdown valves of the station piping are opened in an emergency to vent the high pressure gas therein to atmosphere, the unit comprising a pipe section having a plurality of orifice plates the number and hole area of which is designed to ensure sub-sonic flow through each plate. The unit is preferably used in combination with a modified form of silencer element connected `in-line` downstream thereof.

Abstract: A stringed instrument for training purposes resembles the usual instrument but comprises a body of sound-damping material which replaces the resonance-box to reduce exterior sound, the sound of the strings being transmitted to the ears of the user by a listening device.

Abstract: A method of and a device for attenuating the noise radiated by a free-expion gas jet throughout the audible-frequency range as well as in the ultrasonic and infrasonic frequency ranges. Concomitantly with the complete and shock-free expansion of the gas into the atmosphere, the acoustic field of the jet is organized by the substantial diminution of the low-frequency tones by causing them to pass from the annular section of the jet to the narrow annular section of the nozzle slot. This is followed by sound-wave diffraction on emergence from the slot in the presence of a baffle, and by a wave reflection towards the sound-absorption lining of the device housing. The final noise results from an intensive ejection of ambient air by the primary gas which, leving the nozzle slot, entrains the air by means of turbulence, the air entering through the annular channels of the case, reaching the outer orifices of the nozzle, and dividing into two flows, namely inside and outside the nozzle.

Abstract: The drawings illustrate an odometer for vehicle use, including an idler wheel mounted adjacent the highest-order number wheel, and an endless strip of flexible material mounted around these wheels having a length equal to an integral multiple of the circumference of the highest-order number wheel. An array of indicia is formed on the strip for each rotation of the highest-order number wheel, and distinctly marked to portray, for example, that a second revolution of the highest-order number wheel is in progress.

Abstract: A noise reduction device for use with an impact tool which comprises a deformable block having a flat face and an opening therein for accepting the set of the tool, and a cylindrical housing extending from the block and sealed about the tool, with an open conduit extending from said housing.

Abstract: A noise attenuator or muffler for a compressed air tube type heater is disclosed. The muffler exhaust air through exit apertures located about its periphery and due to its unique design substantially avoids the formation of ice in the muffler.

Abstract: A muffler incorporates a tubular shell that has an acoustically reflective interior circumferential surface. In successive sections taken transversely through the shell, the acoustically reflective surface has at least a portion of its circumference shaped to define at least part of an ellipse or a parabola. Between an inlet into and an outlet from the shell, a fluid flow path extends along an axis lengthwise through the shell. A sound absorptive treatment is disposed along a second axis extending lengthwise through the shell. The treatment is spaced from but communicates with the fluid flow path. At least one of the two axes is defined by corresponding focal points of successive transverse sections taken through the curvilinear portion of the circumference of the acoustically reflective shell surface. In operation, sound emitted from fluid flowing along the fluid flow path is reflected by the reflective shell surface to the sound absorptive treatment.

Abstract: A rotary indicating device comprising a rotary drum supporting respectively rotatably a plurality of indicating plates, a ring-shaped spring fitted on one side surface of the rotary drum and resiliently pressing the respective rotary shaft portions of the plurality of indicating plates in a direction along the diameter of the rotary drum and a member for turning the plurality of indicating plates in turn with the rotation of the rotary drum so as to be able to be simply assembled and to stably hold the indicating plates in the indicating position.

Abstract: A scheduling tool for establishing estimated duration of a contractual obligation involving multiple phases and associated functions thereof is utilized with a normalized scale and various overlays determined in accordance with statistical information relative to criteria useful in determining the duration of the obligation. A manpower allocation device may be used alone or in conjunction with the scheduling tool to estimate the manpower necessary during various phases of different contractual obligations.

Abstract: A composite panel is described in which the face sheets and the core have properties such that the panel produces a double wall resonance near the low frequency end of the principal speech bands and in which the panel produces interaction between the symmetric and antisymmetric mode in the principal speech bands, thereby providing greater than mass-law transmission loss over a substantial portion of the audio frequency spectrum. At frequencies above the principal speech bands effects are determined primarily by the properties of the individual face sheets.

Abstract: Gas turbine exhaust quieting means wherein the low frequency noise which is normally generated by turbulence in the gas turbine exhaust, is suppressed by means of a turbulence suppressing flow distributor. Said flow distributor comprising an elongated, hollow body, having a multiplicity of small holes in the walls thereof. Said flow distributor also providing a means for uniformly distributing the gas turbine exhaust flow over the face of a tubular or splitter type of exhaust gas silencer, which is usually used in combination with the flow distributor.

Abstract: The calculator of this invention is designed to be employed when the lens is extended from the camera body. The calculator includes a measurement scale to be positioned in the desired position to take the picture of the subject. The width of the viewfield is determined. The measurement scale has printed thereon different measurement values. Associated with each measurement value is a series of camera adjustment factors which is to note to the user suggested adjustments to compensate for the lens extension from the camera body.

Abstract: An actuating counter for use in conjunction with a fluid metering device, such as a liquid displacement meter, which can be preset prior to commencement of operation to count out a desired number of product units characterized in that upon actuation of the preset mechanism, further manual operation of the preset mechanism is precluded by an interlock mechanism which is equally adaptable to existing and newly manufactured counters, yet which can be aborted at any time in an emergency.

Abstract: A practice pad for a drum or similar percussion instrument of the type fabricated of a construction material having sound-muffling characteristics and used in a directly supported position on the playing head of the drum, in the use of which all auxiliary structure to hold the pad on the drum vibrating playing head, and thus keep it in place, is eliminated. This is done simply by the advantageous selection of an appropriate weight oil-tanned leather as the construction material for the pad. In use, this specifically selected material has the proper weight to dampen, and thus muffle the drum auditory output and, also, by its sheer weight maintains a flat, surface-to-surface contact with the vibrating drum playing head, thus obviating any need for appropriate clamps or other structural members which typically are attached to the drum and to the pad.

Abstract: This invention comprises an actuator for a mechanical counting device for cording and storing data. This actuator includes a weight having an eccentric center of mass which is freely pivotable in one plane within pre-set limits in response to an externally applied impulse force of a predetermined magnitude to apply a torque force within prescribed limits to a shaft which, upon rotation thereof under the influence of such torque force, actuates the counter mechanism to record a count. Means are provided to apply counter torque force of a constant predetermined magnitude to the shaft, so that the counter is actuated only in response to a resultant torque force of a predetermined magnitude generated by the impulse. Torque limiting means are also provided to permit operation of the counter within an impulse band or range greater than the band or range achievable without use of such torque limiting means.

Abstract: A key in a keyboard for programmable computers, having its farther end recessed to form a nail-sparing shelf for carrying an exchangable mark or indicia. According to the invention the shelf serves as a seat for a flat and transparent pocket for receiving a removable lable carrying said mark, and having its insert opening blocked by the inner edge of the shelf.

Abstract: The invention is for an improved security system for a postage meter, which features an ascending register lockout. Most commercial postage meters contain ascending and descending registers which keep an accounting of the meter's use. The lockout for the ascending register is disposed in combination with, but functions independently from, a descending register lockout also located within the postage meter. Both lockout devices use a locking comb arrangement to sense when a postage value lockout position is reached by their respective register wheels. The descending register lockout provides a pivoting cam to block a shutter bar window when a descending register lockout condition is sensed. The ascending register lockout system provides a slide bar for blocking the shutter bar window when an ascending register lockout condition is sensed.

Abstract: This disclosure pertains to a navigational computer having three arms slideably and pivotably secured to one another. A pair of compass roses are affixed at the intersection of one arm to each of the adjacent arms. Angularly disposed indicia, on the compass roses, and distance and speed indicating indicia disposed on each of the arms, provide computed data resulting from selective angular displacement of the arms and the utilization of selective portions of the lengths thereof.

Abstract: A resettable mechanical counter having a plurality of number wheels and transfer pinions is mounted in a molded plastic housing in which are integrally formed fixed bosses that index the transfer pinions when the number wheels are reset. The transfer pinions are axially located by means of slots formed in the housing and the number wheels are axially located relative to the reset lever mechanism which itself is axially located relative to the housing to thus position the transfer pinions relative to the number wheels.

Abstract: A taximeter housing is securable to a vehicle part in such a manner that only two seals are required to prevent unauthorized tampering with the input connections, the interior components of the taximeter and the taximeter mount, and that only a single seal need be broken when it is necessary to gain access to the interior components to readjust the taximeter for a tariff change.