Abstract: An aperture stop control device for a zoom lens system includes a variable aperture stop, a first sensor for determining the diameter of the aperture stop and providing a first electrical signal representative of the diameter of the aperture stop means and a second sensor for generating a second electrical signal indicative of a designated F number. A signal generator provides a third electrical signal indicative of the focal length of the zoom lens system. A computing circuit computes an output electrical signal as a function of the second and third electrical signals to control the diameter of the aperture stop for automatically maintaining a designated F number during a zooming operation.

Abstract: An improved lightweight diffuser assembly having a plenum chamber formed of fiberglass laminae is provided. The diffuser assembly is universally adapted for interfacing with various size conventional ducts of an air delivery system. The plenum chamber has a variable density across its surface and further includes a fibrous textured interior surface to optimize the sound absorption characteristics. Sheets of laminae fiberglass impregnated with uncured phenolic binders are placed in an appropriate die mold cavity and subjected to both compression and heat. The plenum chamber is cured in approximately a temperature of 700.degree. F. to 900.degree. F. for a time period of approximately 25 to 45 seconds to provide an interior fibrous textured surface. Carbon black and an interior sealing sheet can be introduced into the fiberglass laminae prior to compression.

Abstract: An eye fundus plethysmograph assembly is provided for determining variations in the amount of blood present at the fundus of the eye. A source of at least a first and second wavelength of light energy is specifically directed into a subject eye for reflection from the retina or fundus of the eye. The reflected light is directed at a receiving element that can produce a first output signal representative of a reflected first wavelength and a second output signal representative of a reflected second wavelength. A processing circuit is provided for subtracting one of the first and second output signals from the other to provide a representative measurement output of the amount of blood in the blood vessels adjacent the eye fundus. The output signals can be recorded or displayed in any desired form to facilitate the interpretation of the amount of blood present.

Abstract: The present invention provides a sound producing device that can be combined with a toy hobby horse. A whinny or neigh sound can be produced by child operated movement of reins to stress and subsequently release a weight loaded spring lever. A coil spring is positioned to contact the spring lever for the generation of the noise. A one-way stop mechanism can retain the weighted spring lever until it is placed under sufficient stress by the operator to effectuate its release.

Abstract: A compact optical lens barrel mechanism for relativenonrotational displacement of a series of lens elements forming an optical system is provided. Lens elements can be mounted for selective subdivision into operative lens groups for both focusing and introducing a variable soft focus condition. The barrel mechanism includes a mounting cylinder having appropriate linear alignment elements. A translational cylinder is rotatively journalled within the mounting cylinder. Three lens mounting members can be relatively movable and are designed to each carry a predetermined number of lens elements. The rear lens mounting member can be moved by the translational cylinder to provide a variable amount of spherical aberration to produce a soft focus condition. An exterior focusing ring and a soft focus condition ring can be rotatively mounted relative to the stationary mounting cylinder for linearly moving the respective mounting members.

Abstract: An electrical apparatus housing assembly unit is constructed from mounting columns, a top and bottom panel member and two side panel members. The mounting columns serve as structural components of the electrical housing assembly unit and also as members to which electrical components and the like may be removably mounted. Additional component parts such as facias and spacers may also be mounted to the mounting columns. The facias and spacers, in addition to aesthetic value, provide additional strength to the electrical apparatus housing assembly.

Abstract: A toy vehicle assembly capable of controlled locomotion in response to variations in frictional resistance along a support surface and method is provided. The support surface is a relatively low frictional surface such as a flexible sheet of polyethylene. A subjectively determined higher frictional guide pattern can be placed on the surface such as by a wax marker. The toy vehicle has a pair of driving front wheels and a power rear wheel. The axis of rotation for each of the wheels are non-parallel to the other axes. A coefficient of friction of the power rear wheel is greater than that of the front control wheels. The driving power wheel can propel the vehicle while the front control wheels can respond to variations in the frictional resistance of the support surface to control the direction of the toy vehicle. The frictional path can be subjectively varied and is preferably made from a water soluble material that can be removed from the support surface.

Abstract: A recessed handle assembly adapted for use in cases, panels and more particularly in electrical housing assembly units is disclosed. An aperture is provided in a wall of an electrical housing assembly unit. Into the aperture is placed a handle member which is preferably U shaped and is equipped with a pair of flanges. The flanges engage the exterior surface of the panel. A keeper member which also has a pair of flanges is mounted between the panel and the handle member. The keeper member is of such dimensions that it tightly fits between the panel and the handle member while the flanges of the keeper member engage the interior surface of the panel. The whole assembly is held together by a spring force which results from tight fit of the keeper member between the panel and the handle member. The handle assembly of this invention can be mounted into a panel in a very short time without the use of tools or mechanical skills.

Abstract: A combination vehicle toy and projectile firing mechanism is provided. The vehicle body member has a configuration that simulates a handgun when a plurality of appended members that provide locomotion are removed from the body member. A pair of guiderails and a pivoted lever trigger is mounted on the bottom of the body member and cooperates with a cross bar member to propel an arrow-like projectile. Preferably the body member has a tricycle configuration and an auxiliary motor assembly can be removably attached to provide independent locomotion.

Abstract: A wide angle zoom lens system for use with a 35 mm single lens reflex camera is provided. The zoom lens system is relatively compact and includes two lens groups that can be relatively displaced along the optical axis to provide variation in focal length as desired. The first lens group has a negative refractive power and the image side second lens group has a positive refractive power. The relationship of their refractive powers has been selected to provide adequate correction of aberrations while maintaining the size, weight and compactness required in a modern zoom lens system with wide angle capability.

Abstract: A pressure gauge assembly for aircraft tires and the like having a helical coil bourdon tube sensor capable of indicating a pressure differential between a monitored source of pressure and a calibrated reference source of pressure. The reference pressure is applied to one surface of the bourdon tube coils while the monitored pressure is applied to the other surface of the coils. The resultant movement is a linear indication of any pressure differential. A valve assembly can be provided with the pressure gauge assembly to permit fluidic access to the monitored pressure. If the volume of the monitored pressure is variable such as an aircraft tire, the secondary source of calibrated pressure can be provided with a predetermined pressure relative to the normal tire pressure to compensate for any volumetric changes in the tire during operation. In an alternative embodiment, the bourdon tube can be used to monitor the pressure in a fire extinguisher for indicating any leaks.