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2. Ceiling projector - Wikipedia

   en.wikipedia.org/wiki/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 ...

3. Projection clock - Wikipedia

   en.wikipedia.org/wiki/Projection_clock

   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 or display on any surface usable as a projection screen, most often the ceiling. [1] The clock can be placed almost anywhere if only the projected image must be seen.

4. Ceilometer - Wikipedia

   en.wikipedia.org/wiki/Ceilometer

   A ceilometer is a device that uses a laser or other light source to determine the height of a cloud ceiling or cloud base. [1] Ceilometers can also be used to measure the aerosol concentration within the atmosphere. [2] A ceilometer that uses laser light is a type of atmospheric lidar (light detection and ranging) instrument. [3] [4]

5. The best outdoor projectors in 2024 - AOL

   www.aol.com/news/best-outdoor-projectors-2024...

   Nebula Capsule 3 $399.99 at Amazon. Nebula Capsule 3 $399.99 at Nebula by Anker. Lawrence also recommends the Nebula Capsule 3, a highly portable, can-shaped projector that retails for half the ...

6. CRT projector - Wikipedia

   en.wikipedia.org/wiki/CRT_projector

   A Zenith 1200 CRT Projector based home theater. Visible extending from the ceiling are three lenses, one each for red, green and blue Black and white CRT projector. 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 and enlarged onto a screen ...

7. The 4 Best Budget Projectors for More Affordable Movie Nights

   www.aol.com/4-best-budget-projectors-more...

   For under $500—even under $1,000—projectors are still going to require darkness to really work. Portability: The good thing about affordable projectors is that they're all quite portable. All ...