Abstract: An automatic focusing system for a slide projector which utilizes a pair of photocells is provided with a non-linear response characteristic to introduce a change in the sensor balance point when a glass covered film slide is projected as opposed to when an open film slide is projected. Accordingly, glass covered film slides and open film slides can be randomly intermixed without changing the projector focus.

Abstract: Apparatus (36, 37 and 38) adapted for association with a projector (11) and a compartmented magazine (12) for containing photographic slides for said projector whereby a stack of slides (42) contained in said apparatus are loaded into said magazine utilizing the slide removing (32, 33) and magazine advancement (29) mechanisms contained within the projector.

Abstract: In a reflecting type overhead projector having a light source lamp and a projection lens above a reflecting table formed of a Fresnel lens and a mirror upon which an original to be projected is laid, there is provided a control circuit which switches over supply of electric power to the light source lamp between full and part power supply according to whether the intensity of the light beams from the light source lamp received by a photosensitive element provided in the vicinity of the reflecting table is higher or lower than a predetermined value.

Abstract: A dual slide tray projection system is disclosed. The projector (12) has two independently operating projection mechanisms including gates (24, 26) advancing mechanisms (28, 30, 32, 34) and lens assemblies (202, 204). The slide tray (60) includes an inner (62) an outer (64) ring. The rings are independently advanceable and selectable and are only locked together by locking mechanism (140) when the tray is removed from the projector at the 0 index position.

Abstract: An automatic parasitically driven declinator for changing the tilt angle of the mirror of a heliostat to provide solar declination tracking by the heliostat. The declinator includes an axial gear drive train coupled to the polar axial shaft of the heliostat, which shaft is rotated. A pendulum arrangement coupled via an input shaft to the axial gear drive train is substantially held in plumb position by gravity wherein the gear drive train is driven as it is rotated about the polar axis by the polar axial shaft. An output shaft coupled to the gear train is rotated to drive a skew bar linkage assembly that is connected to the mirror mounting assembly of the heliostat. The gear ratio of the gear drive train assembly is made 365:1 so that the mirror angle is annually nutated a predetermined number of degrees corresponding to the cyclic variations of solar declination.

Abstract: The microfiche carrier slides laterally on front and rear ball bearings between the carrier and subcarrier. The front bearing permits vertical separation of the carrier from the subcarrier and the rear ball bearing then permits the race member carried by the carrier to be withdrawn from between the upper and lower sets of ball bearings. In use the carrier is latched to the subcarrier by a latch carried by the transparent index pressure plate. The subcarrier is mounted on the base by ball bearings. The base contains the electrical components and the light source and condenser lens. The base can be withdrawn from the housing as a unit with the carrier attached.

Abstract: The image projector as disclosed herein demonstrates an apparatus and method for creating a three-dimensional image. The projector is composed of a plurality of modules which are controllably illuminated to form the desired display. The modules are formed to be illuminated and to pass light from within through their walls and to prevent light from entering their outer walls when said modules are not illuminated.

Abstract: A slide projector has a slide exchange element and a slider movable on the latter and having different widths suitable for magazines with different slide compartment widths, wherein the slider is engageable with the slide exchange element under the action of a spring in direction normal to the displacement direction of the slide exchange element, a magazine sensing element senses a magazine inertable into a respective magazine path and provides for disengagement of the slider from the slide exchange element, and an abutment slides in the displacement path of the slider in the disengaged position of the same.

Abstract: A slide previewer/sorter/stack loader having a holder (18) which is adapted to receive two photographic slides in first and second receptacles at one end thereof. The holder is initially positioned at an angle above horizontal so that a first slide placed on a chute (16, 17) will drop into the first receptacle by force of gravity. When in the initial position, the slide in the holder is illuminated by a back light so that the slide can be previewed through a window in the holder and edited. The holder pivots in such a manner that the second receptacle can be positioned over a slide slot (28) above a projector. Means (26) are provided to restrain the slide in the first receptacle during transit from the initial viewing position to the position wherein the second receptacle is positioned over the slide slot. A second slide in the projector is forced upward by the projector slide lifter mechanism into the second receptacle in the holder, and is retained therein by a latch (52).

Abstract: A method and apparatus for manipulating the contrast of sine wave gratings and other patterns is disclosed. The apparatus provides an improvement in a projection system for projecting light along an illuminating path to a viewing screen. The improvement is in a form an image forming system which can be manipulated to adjust the contrast between juxtaposed areas of the projected light distribution image. The apparatus comprises a source of substantially unpolarized light arranged to project along an illuminating path and image forming means and a contrast adjustment means. The image forming means has at least two discrete light transmitting zones disposed in the illuminating path to receive and transmit primary and secondary illuminating light beams respectively. The first zone has juxtaposed areas of sharply contrasting translucence whereby the primary illuminating light beam emanating from the first zone forms a primary image which has sharply contrasting image areas.

Abstract: An energy conduit support for an arrangement between a movable load-consumer and a stationary connection, comprising narrow tubular members with outwardly directed abutments and wide tubular members made of two tubular member halves with inwardly directed abutments, which engage behind and can be bent at an angle relative to each other in one direction, a channel being formed by the abutments of the narrow tubular members, the width of the channel determining the radius of curvature. The channel of the narrow tubular members is formed on two opposite side walls of different widths and on the two other side walls conically. The tubular member halves of the wide tubular members are formed alike and turned 180 degrees with respect to each another pushed on the narrow tubular members and connected with each other.

Abstract: A generator of polychromatic light for a projector of a multicolor image, e.g. as used in the testing of a color-television camera, comprises a spherical mixing chamber with three inlet apertures angularly equispaced about an outlet aperture spanned by a transparent test pattern and with a light-diffusing inner wall surface designed to emit a blend of several color components radiated into it from respective sources. A projection objective juxtaposed with the outlet aperture defines with that aperture and with its own entrance pupil a light cone determining a concave illuminating area of circular outline on the chamber wall; the differently colored light beams radiated into the chamber impinge upon limited wall zones offset from this illuminating area in order to homogenize the outgoing polychromatic beam.

Abstract: An adjustable choke for automatically regulating high velocity flow through a pipe line is provided. The choke comprises a generally cylindrical elongated body including an axially-directed inlet port at one end, means for selectively controlling flow through the regulator at the other end, and a radially-directed outlet port intermediate of the body. A pair of slidable, annular rings contained in the body adjacent the inlet port comprise an upstream ring and a downstream ring. Each of the rings are spring biased from the other. The upstream ring includes a flow passageway and a flow obstructing portion. The downstream ring includes a plurality of flow passageways, at least one of said downstream ring flow passageways being disposed out of communicable flow alignment with the upstream ring flow passageway.

Abstract: A diaprojector for framed diapositives accommodated in at least two different magazines has two tracks each for a respective one of the magazines having smaller and greater diapositive compartment widths, a drive for gradually transporting each of the magazines by a distance corresponding to the width of the diapositive compartments, a sliding element having a width suitable for exchanging the diapositives in one of the magazines, and a rider having a width suitable for exchanging of the diapositives in the other magazine and displaceable on the sliding element between two positions in which either the sliding element or the rider is available for acting upon the respective magazine, and a sensing device operative for blocking the operation of the projector, when the position of the rider does not correspond to the magazine in which the diapositives must be exchanged.

Abstract: The film image is illuminated by the bulb or by ambient light admitted through an aperture on the top of the viewer. The image is projected on a folded light path onto a screen pivotally mounted on the underside of the upper housing to depend into the viewing chamber in the lower housing. The lower housing is pivotally connected to the upper housing and contains a power mirror reflecting the image on the screen into the eyes of the user. When the lower housing is folded (collapsed) over the upper housing the screen pivots into the space between the housings. The screen pivot is moveable to change the screen distance from the power mirror (and the film stage), to adjust the toe-in required of the viewers' eyes for optimism viewing comfort. The microfiche carrier mechanism is generally U-shaped to straddle the light path to the film stage and is positively driven back and forth relative to the housing film stage and engages the fiche on each side of the light path to move the fiche laterally.

Abstract: The invention relates to a parallelepipedic tray intended to accommodate slides (7) which are to be viewed. The tray mainly comprises an upper wall (1) and a lower wall (2) each of which has grooves (6). The slides can be inserted in or removed from the tray via either of two open side surfaces, and to prevent the slides from dropping out when the tray is being handled, the tray has two flaps (8 and 9). Such a tray can be used on a slides viewer which has two carriages (22 and 23) to support and guide the trays, which carriages are disposed symmetrically on either side of optical system (28).