Ceiling projector exteriorInterior of a ceiling projectorAlidade for use with a ceiling projector
The ceiling projector or cloud searchlight is used to measure the height of the base of clouds (called the ceiling) above the ground. It is used in conjunction with an alidade, usually positioned 1000 ft (300 m) away and wherever possible set at the same level.
The projector is normally set at 90°, although 71° 31' may be used, in relation to the terrain. The projector consists of a 430-watt incandescent bulb set in a weatherproof housing. Inside the housing are two mirrors; the first, above the bulb, reflects the light downwards to the second mirror, that then reflects the light upwards to the cloud. Both mirrors are focused to produce a high intensity beam of light that renders a visible spot on the base of the cloud.
The alidade is mounted on a post at a height of 5 ft (1.5 m) from the ground. It consists of an arm with a pointer and open sight at one end and a rubber eyepiece at the other. The arm is mounted onto a curved scale that is marked both in meters and the coded cloud height (feet). The observer looks through the eyepiece and sets the sight onto the spot projected on the cloud and reads the height from the attached scale.
When the cloud is thin the beam of light may penetrate into the cloud. The observer should read the scale where the light first enters the cloud and not at the top. However, a remark may be made as to how far into the cloud the light was able to penetrate as this may be useful. In the case of fog or blizzard conditions the observer should read the scale where the beam disappears.
The ceilingprojector or cloud searchlight is used to measure the height of the base of clouds (called the ceiling) above the ground. It is used in conjunction...
practical to use a balloon the ceilingprojector is used. However, during twilight it may be impossible to use the ceilingprojector and then a pibal (pilot...
formed. Semi-specular high gain screen materials are suited to ceiling-mounted projector setups since the greatest intensity of light will be reflected...
A CRT projector is a video projector that uses a small, high-brightness cathode ray tube (CRT) as the image generating element. The image is then focused...
A laser projector is a device that projects changing laser beams on a screen to create a moving image for entertainment or professional use. It consists...
finished, and the Jack-and-Jill bathroom. The spare room's in-ceiling-projector and ceiling-retracting-screen are installed. The in-ground pool is installed...
the projector is mounted to a ceiling or placed on a table top that is lower or higher than the projection screen. Most ceiling-mounted projectors have...
A projection clock (also called ceiling clock) is an analogue or digital clock equipped with a projector that creates an enlarged image of the clock face...
at a known rate of ascent, to begin to disappear into the clouds. ceilingprojector A type of cloud-height indicator that uses a searchlight to project...
CRT projectors were used instead. In the 2000s, technological innovations in sound systems, video player equipment and TV screens and video projectors have...
weather Ceiling balloon – a balloon, with a known ascent rate, used to measure the height of the base of clouds during daylight Ceilingprojector – a device...
video is generated using multiple short throw high definition projectors in the entrance ceiling and proprietary software is used to pixel map the different...
Generally, residential audiovisual encompasses in-ceiling speakers, flat-panel TVs, projectors, and projector screens. This could include lighting, blinds...
devices for displaying an object to a large audience. Like an opaque projector, a document camera is able to magnify and project the images of actual...
myths, and the Nibelungenlied. In addition, a “master terminal” and a ceilingprojector provide presenters with the option of adding and presenting their...
were complete (except for the fuze) and proposals for twin and quadruple projectors were solicited from Vickers-Armstrongs. An advantage of a rocket weapon...
connectable apparatus used as a touchpad to control computers from a projector. They are used in a variety of settings, including classrooms at all levels...
physics, chemistry, biology, and integrated science classes with high ceilings, projectors, and, in room 74, a balcony. The large and small gyms, locker rooms...
from the projector and the film path may be over rollers along the ceiling of the projection room and surrounds. The lenses of the projector can be automatically...
incomplete list of front-projection CRT video projectors. A number of projector manufacturers produced projectors that were sold under the brand of different...
larger, heavier projectors, there is a problem mounting the projector sideways since nearly all ceiling mounts assume the projector hangs down from the...
Transit Planetarium projector. The projector was highly advanced for its time, weighing almost 1000 pounds less than similar projectors of its time, allowing...
Erector-set rig on top of the projector so that it would take the finished film through the projector, way up to the ceiling and then back down, so the film...
a heavy tail mass, the transducer can effectively operate as either a projector (source) or a hydrophone (underwater acoustic receiver). The transducer's...
it. In the studio, the resulting "background plate" is loaded into a projector with the film "flipped" (reversed), because it will be projected onto...
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