A gage for linear measurement of a workpiece comprises an optical assembly for viewing a linear scale placed for reading upon the workpiece, both the scale and the observed portion of the workpiece being at the same focal length. The optical assembly is slidable either by manual operation or by a control mechanism including a control shaft having spiral grooves which which are diminutive in depth which journal within, for example a thermoplastic bushing housed by the optical assembly. Rotation o...

A pair of closed loop tracks provides a stationary slideway for slide (transparency) holders which are hinged together sequentially in an endless loop arrangement. A particular slide is selected for viewing by advancing the holders in the slideway to a viewing position at which the selected slide is reoriented from a normally radial to a peripheral orientation. Illumination from a source at the axis of the slideway permits viewing without extraction of the slide from the track.

An optical system for use in a copy machine or the like is described as including an optical element for use with an image receiving medium and an image original medium such that an image from the image original medium is propagated through the element, lens inverted by the element, and mirror reversed by the element to impinge upon the image receiving medium.

An optical mount comprising a heavy, rigid support member having finished guide surfaces for rigidly mounting one or more optical devices on the support member. The devices are readily installed and removable by an eccentric lock and are isolated from environmental vibration when installed.

A lens assembly and associated detectors for providing directional informon concerning the location of a source of light with respect to the system optical axis comprising a lens system for separating light rays entering therein into quadrants, a focusing lens for focusing light rays on the lens system and detectors positioned with respect to the lens system such that the separated light rays impinge on the detectors and the outputs of the detectors provide directional information with respect t...

The optical densitometer of the present invention includes a photoresistive element which has a nonlinear relationship between resistance and incident light. A source of light directs light energy through the specimen to be measured and onto the photoresistive element. The intensity of the light from the specimen also varies nonlinearly in accordance with the optical density of the specimen. These nonlinear variations are correlated so that the optical densitometer of the present invention produ...

An accelerometer for providing digital output signals indicative of predetermined levels of acceleration in either direction along a sensitive axis therein. A mass is displaced a defined distance whenever a predetermined acceleration is experienced. This displacement aligns an optical fiber path contained by the mass between a light source and a light sensor causing the light sensor to produce an output signal. Different levels of acceleration can be detected by the use of a plurality of optical...

An optical wattmeter for measuring the magnitude of the instantaneous power being transmitted over a high voltage line utilizes a monochromatic circularly polarized light beam which is transmitted through an electro-optical modulator such as K.sub.err or Pockels cell subjected to an electric field produced by the high voltage line proportional to the voltage component of the power to be measured. The light beam, doubly refracted in the modulator thereby to produce an elliptically polarized beam,...

The disclosed ophthalmodynamometer, an instrument for measuring the dynamic opthalmic artery blood pressure, is herein called an optical ophthalmodynamometer because it provides coincident axes of pressure application and visual observation of the characteristic arterial pulsations at measurement of systole and diastole. This instrument is advantageously and readily adapted as an additional attachment for the versatile slit lamp, which is a basic instrument used for eye examination and does not ...

A wedge of transparent material having first and second angularly displaced faces is positioned in a controllable manner with respect to a right angle prism with one of the faces of the wedge parallel to the hypotenuse face of the prism. A piezoelectric element is positioned to drive the wedge relative to the prism between a first position wherein the wedge and prism are in near optical contact and a second position wherein the wedge and prism are spaced by a distance of about one wavelength of ...