Consider the rain gauge used in GLOBE, CoCoRaHS, and other citizen science programs. Just four pieces plus 2 mounting screws – an inner graduated cylinder, an outer cylinder, a cap/funnel, and a mounting bracket. The area of the outer tube is exactly 10 times the areas of the inner tube and the cap/funnel, so the graduations on the inner cylinder can be spaced ten times further apart. Thus, 0.2 mm of rain fills the inner tube to a depth of 2.0 mm, which one can read.
In addition, if heavy rainfall fills the inner cylinder, the rest of the rainfall overflows into the outer cylinder, which...
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Posted in:
Curriculum:
STEM
Field Campaigns:
El Niño
GPM
GLOBE Science Topics:
Backyard Science
GLOBE Protocols
Investigation Areas:
Atmosphere
Primary Audience:
Teachers
Students
Alumni