16
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MEASUREMENTS, TIME
Free fall apparatus
This apparatus is designed to be used with an Electronic
Counter to determine the fall time for a freely falling ste-
el ball. The apparatus consists of a release mechanism
Experiment
which also acts as the start switch, a strike plate which
acts as the stop switch and gold-plated steel balls. The
E-1
0
1
release mechanism is provided with two dia. 4 mm bana-
na plug connectors for connecting safety dia. 4 mm
banana plug leads to the Counter start switch input. A 10
mm diameter mounting rod for supporting the mecha-
nism on a lab stand is supplied. The strike plate is also
provided with two dia. 4 mm banana plug connectors for
attaching this unit to the Counter stop input.
1980.10 Free fall apparatus
1980.10
Microphone
The microphone is well-suited for the measurement of
2485.10
sound frequencies, the speed of sound and the recor-
ding of sound for Fourier transformation.
The sensitive microphone is very small and therefore
very suitable for measurements of sound interference.
It is supplied with a one meter cable with a 3-pole DIN
connector which can be connected directly to the ele-
ctronic counter type 2002.50 or
student timer type 2002.60. The
microphone can also be connect-
ed to an oscilloscope or other
measuring instrument via a type
2485.10 2515.60 power supply. The frequ-
ency range is 20-20.000 Hz. Sup-
plied with 10 mm diameter sup-
Experiment
port rod. Dimensions: Length 105
E-1
02
mm, greatest diameter 30 mm.
2485.10 Microphone without
stand
2482.00
Clapper board
This clapper board is ideal for producing the sharp
sound pulse required for measuring the speed of sound.
Produced with two hinged hardwood blocks.
Dimensions: 27 x 50 x 300 mm. Mass: 280 g.
2482.00 Clapper board
®
Science Equipment for Education Physics
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