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Secchi Disk
used to determine the turbidity of natural water. Thick metal disk
of alternate black and white color allows fast easy measurement.
18cm diameter. Comes with 50 feet of string.
No. SF226-SD. Only $3.50 |
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Liquid Convection Apparatus
For demonstrating the phenomenon of thermal convection in liquids caused
by temperature ventilation. Consists of a rectangular shaped
borosilicate glass tube with a funnel shaped opening at the top for
filling liquids. when this tube is partially filled with water and heated
at one corner after adding a medium (dye, potassium permanganate crystals,
saw dust, aluminum powder, etc) the movement of the medium illustrates the
formation of convection currents.
No. SF226-CA. Only $16.95 |
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Gas
Convection Apparatus
For demonstrating the phenomenon of convection in air and the principle of
room ventilation. Consist of an enameled metal box (20cm x 20cm x
10cm) having a sliding glass door and two glass chimneys. When a
candle in a socket is placed under one chimney and a smoldering tape
or touce paper is placed underneath the other chimney, the flow pattern of
smoke dramatically illustrates the formation of convection currents.
Candle tape and touce paper not included.
No. SF226-CB. Only $18.95 |
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