Abstract: A mile post and mileage indicator for maintaining the exact mile post position of a vehicle while said vehicle is travelling upon a roadway containing designated mile post signs, which increase or decrease in a particular direction. This indicator may also be used to indicate exactly how far the vehicle has travelled or how much further it must travel before it reaches a certain destination. The indicator contains a plurality of dials, each dial having two columns of numbers. One column is numbered in an increasing sequence, and the second column is numbered in a decreasing sequence. A shutter is provided for enabling only the increasing or the decreasing columns to be viewed at any one time.

Abstract: A keyboard assembly incorporates a plurality of key members molded of thermoplastic material, each of the keys having an integrally formed pivot wall supported on a pair of pivot points disposed on a pair of pivot members integral with a pivot bracket. The key members are located laterally by the pivot wall being gripped between the pivot points, and is located longitudinally relative to the pivot members by means of two pairs of locating ridges, one pair on each side of the pivot wall. A pair of resilient tabs integral with the plastic key member engage the upper corners of the pivot members, and a rib extending downwardly from the pivot wall extends into a slot to resist twisting of the key member. A key guide strip for the key member has a pair of vertically aligned projections, for supporting bumpers which guide the forward end of the key member and which provide a cushioning action for noiselessly stopping of upward movement of the key member.

Abstract: A replenisher system for photographic processors includes an automatic calibration system. A film sensor senses when film approaches the density sensor (and guarantees that the sensor is clear), and the automatic calibration system calibrates the density sensor (or other film parameter sensor) of the replenisher system prior to the film reaching the density sensor. The automatic calibration is performed each time a strip of film enters the processor, and reaches the density sensor, thereby assuring that drift and other variations in density sensor output unrelated to the film density are eliminated. In addition, the automatic calibration system provides a data valid signal after the density sensor has been calibrated to allow the replenisher control to accept the output signals from the density sensor and control the supply of replenisher fluid to the processor only for a limited time interval after calibration (i.e. while film is actually present in the density sensor).

Abstract: An electric guitar has a neck of a unitary elongated construction which is coupled to and extends through the body at least up to a location where a bridge and a tail piece are provided, and at least one member of a relatively hard wooden or light metallic material interconnecting the base portion of the neck to the body, whereby the acoustic characteristics of the guitar are greatly improved.

Abstract: In a bass-reflex type speaker system, in which sound signal waves radiating from the back of a speaker within a cabinet are emitted out through a hollow duct while the phase of the sound signal wave is reversed, the improvement comprising at least one dividing plate secured within the hollow duct and disposed parallel to the longitudinal direction of the duct or a hollow pipe with a diameter smaller than that of the duct, the hollow pipe being coaxially disposed within the hollow duct where the pipe may be made of sound absorbing material.

Abstract: A calculator and method for simply and quickly selecting appropriate spot type fire detectors and determining their preferred locations in a chosen space division in accordance with standard spacing ratings. The slide rule-like calculator includes a body member, a slide member slidably positioned within said body member, and in one embodiment a cursor slidably encompassing both the body member and slide member. The body member comprises at least one logarithmic scale representing one dimension of the space division and the slide member comprises at least one logarithmic scale representing the second dimension of the space division. Additionally, at least one fire detector scale, established with reference to standard space detector ratings, is included either on said body or slide member and an index or zero line is included on the other member.

Abstract: An adjustable display having interworking parts whereby upon manipulation interference frequencies emitted from spurious harmonic and imaged electromagnetic radiators interfering with an intended or expected bracketed received frequency can be isolated and identified for later corrective action, such as elimination of the interference frequencies. A method for establishing emitted frequencies which might interfere with expected or intended targeted received frequencies in a receiver is also described and taught.

Abstract: A silencer consists of concentric spaced apart longitudinally extending shells connecting two bulkheads, each having an outer imperforate face, the space between the faces of each shell containing noise absorbing material such as rock wool. Each shell has a longitudinally extending duct to enable the gases to escape, the duct in the inner shell being offset in relation to the duct in the next shell; the inner shell is connected to the inlet pipe and the gases escape via the duct of the inner shell, then through the space separating the two shells and finally through the duct of the next shell.

Abstract: The sound absorbing and diffusing unit is provided for assembling an acoustic screen which can be placed in front of a wall inside an acoustic room for improving a sound effect therein. These units are detachably joined together with each other so that they can be easily separated and assembled again to form an acoustic screen or partition having another shape or construction to adjust or modulate a sound effect. A decorative sound absorbing porous panel having a desired picture or pattern can be easily hung against a wall. The decorative panel can be reversely hung on the wall to provide another interior ornamention. Accordingly, an acoustically correct room and a desired ornamentation on a wall inside the acoustic room can be easily obtained and changed without providing a rigid reverberating surface of the room.

Abstract: A method and computational aid for determining the optimum cycle lengths for use in a vehicular traffic control system wherein inbound and outbound traffic flow are equally favored. The method employs the technique of determining optimum cycle lengths by utilizing harmonic relationships found to exist between the time separations of the controlled arterial intersections and other key traffic control parameters. The method may be practiced by means of a highly simplified graphical computational aid which provides a clear visual indication of candidate optimum cycle lengths for a particular group of intersections which requires only prior knowledge of intersection relative locations. The unique format of the graphical computational aid provides, in addition to the candidate optimum cycle length information, a visual indication of the quality of the candidate solution obtained for each of the controlled intersections of the group.

Abstract: A loudspeaker having a magnet housing and mounting flange is mounted within an enclosure including an inner member of corrugated fiberboard cut at angles to the corrugations thereof to define hingedly interconnected panels foldable to form a generally prismoidal housing with a speaker opening in one wall and with support panels extending from the bottom of the housing and recessed to receive the speaker magnet housing therein to support same. The walls of the corrugated housing are held in assembled configuration by interlocking tabs and slots and interlocking tongues and recesses, and the speaker mounting flange overlies the outer surface of the one wall and is trapped thereagainst by a face panel of corrugated fiberboard.

Abstract: A stringed musical instrument has a composite neck and head structure comprising an elongated reinforcing member having a T-shaped cross-sectional area extending throughout the length of the instrument neck and terminating in a forked head. The generally semicircular cross-sectional configuration of the neck is achieved by the addition of a top lamination and side inserts of materials which produce the desired feel and appearance.

Abstract: A calculator for determining optimum pavement design comprising a pair of slidable members and a plurality of scales associated therewith for determining the Design Traffic Number, Structural Number, depth requirements and costs.

Abstract: In order to adapt a general-purpose calculator to specific tasks, the keyboard of that calculator is covered by a mask including a resilient membrane overlain by a rigid panel having cutouts registering with keys whose function is to be preserved. The cutouts receive extension keys glued or otherwise fastened to the membrane, depression of any extension key operating the underlying original key. The functions of the operative keys can be modified, in accordance with the contemplated use, by insertion of a stored-program cassette associated with the particular mask employed.

Abstract: The invention is a music training service that visually and audibly assists a music student in associating the location of music notes on the lines and spaces of a simulated staff with the musical pitches of the notes.

Abstract: This invention relates generally to graphic calculating methods and apparatuses, and in particular to an apparatus by which the values and other factors pertaining to bonds, stocks and other securities may be calculated when certain values and other factors are known.Heretofore, it has been customary to calculate certain values or factors of bonds and the like, given or knowing other values or factors, by mathematical computation according to certain formulas or by the use of certain tables. These methods have, of course, been accurate and have proved to be satisfactory except that in carrying them out, it has been necessary to do considerable work and up to now they have not incorporated all significant values or factors. The primary object of the present invention is to provide a simple device by the use of which certain values or factors of bonds and the like may be quickly ascertained without mathematical computation and, if they were available, without the use of tables.

Abstract: Exhaust muffler for sound suppression, particularly designed as an automotive muffler, which comprises a gas inlet tube communicating with a first chamber in an outer, preferably cylindrical, casing, and an exit tube coaxially aligned with the inlet tube within the casing, the inner end of the exit tube being spaced from the inlet tube and communicating with the first chamber. An imperforate boundary or baffle is positioned in the annulus between the outer wall of the exit tube and the inner wall of the outer casing, and intermediate the ends of the exit tube, the annular space to the rear of the baffle, between the exit tube and the casing, forming a second chamber which is filled with a sound absorber such as glass wool. The exit tube is perforated along the area thereof adjacent to the second chamber for fluid communication therewith.

Abstract: A horn loudspeaker construction wherein an integrated sound chamber and horn assembly is provided by two uniquely configured members that form a highly efficient horn loudspeaker capable of being utilized within a four-inch type electrical box. The horn loudspeaker includes a sound chamber for receiving a magnetic loudspeaker driving assembly and diaphragm. The sound chamber also includes a sound opening having a predetermined acoustic orientation. A first horn stage has a first opening acoustically coupled to the sound opening and is characterized by a flare rate that expands as the first horn stage extends away from the sound opening. The first stage includes an acoustical orientation at the output end that is at least 90.degree. disposed from the acoustical orientation of the sound opening.

Abstract: Calculating device provided with scales for calculating radioactive doses and intensities, in which the scales are arranged for calculating the product of the intensity in a radioactive area at a given instant and a dose factor to be determined by experiment. This dose factor depends on the moment when the contaminated area is entered and on the time spent in the area.

Abstract: A calculator for facilitating the layout of parking lot stalls of desired length and width at a desired angle. The calculator includes a first member having orthogonal length and width scales as well as angle indicators relating to desired stall angle. A second member is pivotable on the first, and includes indicia related to desired stall length and width. The second member is positioned for pivoting on the first, is aligned according to the desired stall data to provide a direct readout of the orthogonal length and width dimensions necessary to lay out the stalls.