mod 17

• Barograph a barometer with a writing arm that records barometric pressure, which rises and falls on a revolving scroll of paper.
• Thermograph an instrument that measures and records both temperature and humidity.
• Ceiling light projector an instrument that projects light beams to the clouds
• Clinometer an instrument that determines the height of the cloud base by measuring the distance of the cloud base to the ground
• Ceiling balloon a balloon filled with hydrogen or other gas lighter than air, which is used to determine the height of the cloud base of clouds above ground level during daylight hours.
• 8-inch Rain Gauge so called because the inside diameter of the collector is exactly 8 inches above a funnel that conducts rain into a cylindrical measuring tube or receiver.
• Theodolite –an instrument that determines wind speed and direction.
• Radiosonde it is used to measure temperature, pressure, and relative humidity in the atmosphere.
• Sling Psychrometer consists of a dry and wet-bulb thermometer.