A phosphorescent golf ball, which emits a glow of light, is provided, for ease of finding the ball in the dark. A method of manufacture is also provided. In the preferred embodiment, the golf ball includes a flexible core member having phosphorescent glow-in-the-dark glowing means to generate a glow of light and for emitting the glow of light that is visible in a dark environment after receiving at least one of light and heat energy and a transparent cover means encircling the flexible core memb...

The present invention relates to a tire having a portion thereof such as a sidewall component that glows-in-the-dark due to the presence of a phosphorescent layer thereon. The present invention also relates to a tire having, and to a process for incorporating, a phosphorescent decal on the sidewall component. Very small amounts of phosphorescent material are used, resulting in a low cost safety tire.

The invention provides an interactive dark ride configured and designed to stimulate the development of creative thinking and problem solving abilities and to encourage group cooperation and team work. A dark ride vehicle is also provided having inward-facing seating adapted to facilitate socializing and group gaming activities among ride participants during the ride sequence. Various interactive effects are provided along a defined ride path and/or along various associated ride cueing areas. Th...

A dark field projection display includes a light source, a spatial light modulator, and an optical system for directing light from the light source onto the spatial light modulator. The optical system includes a plurality of optical subsystems and a plurality of reflectors. Each of the optical subsystems has an input aperture and is arranged to image light from the light source, the subsystems forming a spatial distribution of source images whose relative positions are different from the relativ...

Dark field viewing apparatus comprises either (a) a source of coherent plane wave radiation and focused coherent receiving means, or (b) a source of focused coherent radiation and a coherent receiver of plane wave radiation, the source and receiver being axially aligned in both cases; and elimination means to eliminate any radiation which in the region of the focus would travel substantially parallel to the axis of the apparatus. The apparatus may be a transmission or a reflection scanning acous...

Glow in the dark artwork which includes a luminescent layer formed of a luminescent material such as a fluorescent or phosphorescent paint or coated layer. The luminescent layer is secured with its luminescent surface covered by image means. The image means has an image formed on its surface via a plurality of image defining opaque and translucent areas. Opaque areas of the image means prevent photons emitted from the excited atoms of the luminescent material from passing through the opaque area...

A dark field infrared telescope. Energy from an infrared scene is focused by a lens (10) onto a thermoptic modulator (12) comprising an optical structure (16) containing a thin film of vanadium dioxide disposed to form the faceplate of a conventional cathode ray tube. The modulator, normally nonreflecting of infrared energy, may have reflecting spots written at selected coordinates thereon by an electron beam from the cathode ray tube. A reflecting spot written on the modulator optically couples...

A pre-amplifier for photomultiplier tubes includes means to compensate for the combined dark current and noise output of a photomultiplier tube without inducing a noise dependent offset voltage at the pre-amplifier output. A feedback amplifier and a compensating network, including a capacitor, cooperate to monitor the pre-amplifier output and during this time to maintain the feedback amplifier in a linearly responsive state while charging the capacitor to an amount necessary to clamp the average...

The composition comprises a primary phase of forsterite ceramic to which chromic oxide and cobaltic oxide are added in substantially equal amounts to darken the composition while not significantly changing the physical properties thereof.

An automatic dark current control for a television (TV) camera or the like comprises the combination of a dark current level sample-hold circuit and a unique low level clipper in parallel with the video output line from the camera vidicon. An electronic switch in the sample-hold circuit is closed once during each field for the duration of one horizontal line sweep of the vidicon electron beam behind the mask on the photosensitive vidicon surface to charge a capacitor to a level corresponding to ...