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Weather—Humidity
Hygrometer, Mason Form
Measure relative humidity. Two thermometers are mounted on a heavy-duty plastic
wall-mounting panel. One thermometer remains dry; the second thermometer has
a cotton wick attached to its bulb, which dips into a plastic cistern filled with water.
The relative humidity is determined by comparing the temperature readings of each
thermometer against the tables found in the relative humidity chart provided.
Catalog No. Description Price/Each
AP5066 Hygrometer, Mason Form $59.55
Digital Hygro-Thermometer Clock See page 629.
Thermo-Hygrometer See page 629.
EARTH & SPACE SCIENCE WEATHER
Hygrometer,
Mason Form
AP5066
WEATHER—PSYCHROMETERS continued on next page.
Weather—Models
Ultimate Cloud-Forming
Apparatus
By: The Flinn Staff
Create atmospheric conditions that produce rain, fog and clouds. By introducing
smoke from a burning match and a little water vapor to the cloud-forming apparatus,
you can create a dense cloud over and over again simply by squeezing and releasing
the large rubber bulb. Under high pressure, air can hold a greater amount of water
vapor than it can under less pressure. When the pressure is lowered suddenly, the
excess vapor condenses and forms tiny droplets around each smoke particle.
Catalog No. Description Price/Each
AP5302 Ultimate Cloud-Forming Apparatus $30.45
Weather—Psychrometers
Sling Psychrometer—
Student Activity Kit
An easy-to-use and inexpensive sling psychrometer.
Quickly determine dew point and relative humidity with the wet-bulb/dry-bulb
technique. Includes two thermometers mounted on stiff vinyl backing, wet-bulb
sleeve, sling handle and mounting screw. A reproducible instruction sheet provides
concept explanation s, psychrometer chart and sample calculations.
Individual kit is complete for one psychrometer. Small-size kits include materials
to make 5 psychrometers. Full-size kits include materails to make 15 psychrometers.
Refill kits contain materials only.
Catalog No. Description Type Price/Each
FB1582 Sling Psychrometer—
Student Activity Kit
Full-Size $105.00
FB0543 Individual Kit 10.15
AP10180 Full-Size, Refill Kit 66.95
AP10258 Small-Size 59.25
AP10102 Small-Size, Refill Kit 100.00
Ultimate Cloud-Forming Apparatus
AP5302
Sling Psychrometer—
Student Activity Kit
FB0543, etc.
Pocket Sling Psychrometer
The best-designed sling psychrometer we’ve seen for student use. Durable, rugged
and mercury-free this instrument will hold up quite well in the field. The entire instrument
is packaged in a self-contained plastic case, which easily opens up to a form
the sling psychrometer. A “slide rule” type design built into the case makes conversion
of the wet and dry bulb measurements to the percent of relative humidity quick
and easy. Thermometer range is 20–120 °F.
Catalog No. Description Price/Each
AP7239 Pocket Sling Psychrometer $99.30
Pocket Sling
Psychrometer
AP7239
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