Abstract: An acoustical guitar is made up of a central body section having collapsible wing panels slidably interconnected to opposite sides of the body to form a common sound chamber, and a neck is releasably connected to one end of the body. The interior of the body is reinforced by a combination of truss rods and an adjustable brace member to retain optimum alignment within the body itself and between the body and wing panels.

Abstract: To reduce noise, an automotive exhaust tailpipe has a convoluted surface at or near its outlet to generate pairs of counterrotating axial vortices within the exhaust gases just before or just as the gases exit the tailpipe. The convoluted surface may be the internal surface of the tailpipe, or a thin-walled convoluted member may be disposed within the tailpipe near its outlet end.

Abstract: An alignment arrangement for use with a photograph enlarger apparatus is disclosed herein. The enlarger apparatus includes an enlarger head assembly, an enlarger easel and means for supporting the enlarger head assembly above the easel. The alignment arrangement include a first mirror member which is configured to lie on the enlarger easel and a second mirror member which is connected to the enlarger head assembly, at a particular location for aligning the camera with the easel in a specific way. There is also disclosed herein a specific assembly for adjusting the position of the easel itself.

Abstract: A pressure developing device in an image recording apparatus for recording an image on the recording medium, includes a pair of pressure developing rollers to be separated from and contacted with each other, and a pressurizing unit disposed on either one of the pressure developing rollers for pressurizing one of the pressure developing rollers toward or away from the other of the pressure developing roller. A pressure control unit controls the pressurizing unit in such a fashion that one of the pressure developing rollers is placed in contact with and pressurized against the other of the pressure developing rollers under a plurality of pressure conditions by the pressurizing unit so that the pressure strength between a pair of pressure developing rollers is gradually decreased from the center to the ends along the axial direction of the developing rollers.

Abstract: A loudspeaker housing which is a one-piece casting or is assembled of two or more separately cast sections is obtained by pouring into one or more mold cavities a mixture of three components, namely a hard first component (e.g., particles of sand with a grain size of 0.1 to 3 mm) having a high specific weight, a second component which has a viscosity of between 150 and 10,000 mPa.s (such as a twin-component adhesive or a grouting compound), and a relatively soft but heavy third component (such as granulated rubber tires and/or polyvinyl chloride and/or polyethylene). The sound damping characteristics of the thus obtained loudspeaker housing are superior to those of housings which are made of wood, plastic or ceramic material.

Abstract: The positive characteristics of loudspeaker diaphragms are improved by the use of a thermoplastic polyurethane sheet with a thickness of 0.06 to 0.8 mm at least for the moving part (1).

Abstract: This invention relates to an opening/closing apparatus for preventing abrupt fall and rotation of a keyboard cover in a keyboard musical instrument.

Abstract: A loudspeaker of the present invention includes a loudspeaker cabinet and at least one loudspeaker element having a loudspeaker membrane. A plurality of sound passages define a cavity in a wall of the cabinet, and each sound passage terminates on one end in a proximal aperture acoustically coupled to the loudspeaker element and on the other end in a distal aperture acoustically coupled with exterior surrounding of the cabinet. In this way, the loudspeaker membrane is acoustically coupled with the exterior surroundings of the cabinet. The distal aperture of a one sound passage communicates with a distal aperture of another sound passage, and the sectional area of the distal aperture of the first sound passage is different from the distal aperture of the second sound passage. The first and second sound passages have different lengths.

Abstract: An image recording apparatus having a lens unit and a mirror unit. The lens unit and the mirror unit are movably supported by a frame of the apparatus. A cam plate is provided at the lens unit, and a lever is in abutment with the cam plate. When the lens unit is moved in a direction, the cam plate is also moved, so that the lever is pivotally moved. The lever is abutted on the mirror unit. The pivotal motion of the lever, the mirror unit is also moved in another direction. The cam plate has a plurality of cam surfaces each defining respective copying magnifications.

Abstract: A finder device is disclosed comprising a first lens group having a positive refractive power to form a first image, a second lens group having a positive refractive power to re-form the first image, and an eyepiece lens group having a positive refractive power to observe the image the second lens group forms, wherein zooming is performed by moving the first and second lens groups along respective different loci of motion from each other.

Abstract: A guitar has a hollow plastic body including spaced front and back panels, and a foam plastic core disposed between the panels, whereby upon vibration of the panels air trapped within the individual cells of the foam core are alternately pressurized and depressurized, thus to enhance the musical output of the guitar.

Abstract: A marching percussion instrument stand has a new and useful improvement for mounting percussion instruments to a stand by a musician-member of a marching band. The device includes a plurality of vertical mounting bars, supported by, and attached in an offset position above horizontally disposed support bars or feet. The vertical mounting bars are attached in an x-shape and carry supporting tubes each of which, in turn, support with the assistance of set-screws, solid, cylindrical rods for mounting a variety of percussion instruments. In one embodiment, the device is used in combination with a conventional dual arm vest carrier for supporting a plurality of drums. In another embodiment, the device is used to support a single marching snare drum. The utility of the device is illustrated in the fact that it can further be used to support any size bass drum in a vertical or angled playing position.

Abstract: An image recording apparatus incorporating two sheet cartridges each storing a photosensitive recording sheet. In one example of the invention, one of the sheet cartridge stores a microcapsule sheet adapted to record a full-color iamge and the other sheet cartridge stores another kind of microcapsule sheet adapted to record a monochromatic image. When a monochromatic image recording is to be performed, the relevant microcapsule sheet is selected and conveyed past an exposure station, a developing station, and a fixing station at a speed higher than a conveying speed of the full-color image recording microcapsule sheet. In another example of the invention, one of the sheet cartridge stores a microcapsule sheet adapted to record an image of a positive film and the other sheet cartridge stores a thermally developable silver halide photosensitive sheet adapted to record an image of a negative film.

Abstract: Fingering positions, musical techniques and effects are rapidly and accurately recorded in a written musical repertoire by reproducing, duplicating or imprinting, as by stamping, a graphic representation of the fingerboard of a musial instruments in the appropriate section of a lyric sheet, music sheet or chord chart, thereafter marking or noting on the reproduction or imprint, or adjacent thereto, the placement of fingers in preferred arrangement and the like. The imprint or reproduction can be made by means of a rubber stamp or similar ink transfer or reproducing device, which bears on one or more surfaces, the raised configuration of the graphic representation thereof, which after inking can be applied to the proper section of the written musical repertoire. This method and device affords both time saving and extremely accurate musical information for immediate and future reference.

Abstract: A mechanism is disclosed for automatically turning pages of a music manuscript or the like. The manuscript is supported on a music stand or the like, with the upper edges of its pages at or near the top of the support. Behind the support is a shaft mounting a plurality of pivotally movable, spring actuated control plates, each mounting a wire-like page turner element having an elongated laterally extending portion engagable with an outer upper corner area of a manuscript page. A sequential release mechanism, including a release pawl, operates in sequence to release the control plate for allowing the top most page of the manuscript to be turned, after first blocking the control plate for the next subsequent page to be turned. The release pawl mechanism permits any number of pages to be quickly back turned and brought into position for subsequent one-at-a-time release by the mechanism.

Abstract: A chromatic chorded zither is provided with at least one auxiliary damper comprising a rigid bar having string-engaging damping pads for converting the instrument for play in a diatonic scale. In one version of the instrument, retainers are provided on the chord bar housing for removably mounting the auxiliary damper alongside one of said chord bars, with the damping pads held in engagement with predetermined strings. In another version, the auxiliary damper bar has a tongue which fits into an opening of the chord bar housing. The damping pads of the auxiliary damper are arranged in a pattern to mute all strings of the instrument other than those corresponding to the diatonic scale for a particular key. With a set of several auxiliary dampers, the chromatic instrument can be converted to play in any one of several diatonic keys. The damper bars can be readily installed or removed with one hand, and take up very little room.

Abstract: Presented is a universal adapter ring for use in interconnecting a camera of the single lens reflex type to an optical device in a manner that maintains the alignment of the optical axes of the camera and optical device and secures the two together. Sets of coaxially arranged threads are formed on the spaced faces of the ring, and a resiliently deformable spring-steel band is coaxially arranged within the ring in association with adjustable screws that may be digitally manipulated to deform the spring-steel band into tight engagement with the cylindrical eyepiece of an optical device. A centrally apertured protective shield plate is also provided extending diametrically across the adapter ring to form an abutment against which the optical device may abut surrounding the aperture to prevent the optical device from impinging on the lens of the camera, or dropping into the camera when the lens is removed and for preventing stray light from entering the camera.

Abstract: A bridge assembly for a stringed musical instrument having a block-like platform member secured to a bridge member which is fixed with respect to a sound board cover of the instrument the bridge member has an upper surface with a groove therein seating of the platform member. The platform member has a lower portion fixedly inserted in the groove and an integral upper portion extending out of the groove and above said upper surface of the bridge member. A string of the instrument passes on a saddle under tension, the contact of the string with the saddle establishing the vibration length of the string. The saddle is connected to the platform member for longitudinal adjustment thereon to effect string length fine tuning.

Abstract: An image recording apparatus having a sheet cartridge in which a rolled photosensitive recording medium is accommodated. The sheet cartridge has a sheet retaining device for preventing the recording medium from being retracted into a cartridge casing. The retaining device also provides a light shielding member. The image recording apparatus also includes structure for preventing the cartridge from being removed in a case where a residual recording medium is still rolled in the cartridge casing. The image recording apparatus is provided with a wiper member for removing dusts deposited on a surface of a feed roller. Further, a sensor element is provided for detecting non-rotation of a takeup shaft or a slack of the recording medium.

Abstract: An image recording apparatus for recording an image orresponding to an image corresponding to an original image on a photosensitive recording medium. This apparatus uses at least one mask member having a surface on which a light shielding image corresponding to the original image. In order to reproduce a clear image, various factors which may cause to change the amount of exposure are compensated for. Such factors includes the thickness of the paper of the mask member, the paper quality of the mask member, the condition of a laser printer which prints the light shielding image on the mask member.