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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.

3. Ceiling fan - Wikipedia

   en.wikipedia.org/wiki/Ceiling_fan

   It is considered the most energy-efficient motor ever manufactured for ceiling fans (apart from the DC motor) since it consumes less energy than a household incandescent light bulb. The Emerson "Heat Fan", the first ceiling fan to use a stack motor A close-up of the dropped flywheel on a FASCO "Charleston" ceiling fan. Stack-motor ceiling fans.

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. Crookes radiometer - Wikipedia

   en.wikipedia.org/wiki/Crookes_radiometer

   A Crookes radiometer in action. The radiometer is made from a glass bulb from which much of the air has been removed to form a partial vacuum.Inside the bulb, on a low-friction spindle, is a rotor with several (usually four) vertical lightweight vanes spaced equally around the axis.

6. Wet-bulb temperature - Wikipedia

   en.wikipedia.org/wiki/Wet-bulb_temperature

   The wet-bulb temperature is the lowest temperature that may be achieved by evaporative cooling of a water-wetted, ventilated surface.. By contrast, the dew point is the temperature to which the ambient air must be cooled to reach 100% relative humidity assuming there is no further evaporation into the air; it is the temperature where condensation (dew) and clouds would form.

7. Talk:Ceiling fan - Wikipedia

   en.wikipedia.org/wiki/Talk:Ceiling_fan

   "The Fan Book" is the one and only book written solely about ceiling fans; and there are no other books in the Library of Congress database which even have a section on ceiling fan history, evolution, or anything like that. Unfortunately, it's kind of a specialized subject area.