3B Scientific Electrostatic Equipment Set User Manual

3B SCIENTIFIC® PHYSICS

Electrostatic equipment set U8491500

Instruction sheet

11/07 ALF

®

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This equipment set can be used in conjunction with
an electrostatic generator such as a Wimshurst machine
(e.g. U15310) or a Van der Graaf generator (e.g. U15300)
to perform a wide variety of experiments investigating
electrostatic phenomena including some historic ex­periments.

1. Safety instructions

• Discharge experimental equipment before touch­ing.

• Discharge Wimshurst machine and Van der Graaf
generator before touching.

• When using a Van der Graaf generator, attach the
ground terminal to ground.

• Perform experiments only with high-voltage equip­ment whose short-circuit current is less than 15 µ .

2. Description, technical data

The experiment components are equipped with 4-mm
connector pins so that they may be quickly mounted
on or removed from an insulated stand. Connection
chains are included for connecting sources of charge,

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bo

bn

but experiment leads with 4 mm plugs can also be used.
We recommend using the Wimshurst machine U15310
as the source of charge for these experiments.

2.1 Scope of delivery (see illustration)

1 Luminous pane
2 Box with spherical electrode
3 Triskelion wheel
4 Friction rod, plastic with 4 mm plug
5 Storage stands
6 Needle bearing with connector pin
7 Hook stand for elder pith double pendulum
8 Bundle of tissue paper strips on rod
9 Pieces of elder pith (10 in a box)
bl Base plate on connecting pin with rolling sphere

race

bm Connection chains (2 each)
bn Conductor sphere 30 mm Ø, with connector pin
bo Box with pointed electrode
bp Stand base
bq Stand rod, insulated with retaining and

connecting socket

br Bell chimes

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3. Instructions for use

• The equipment only produces satisfactory experi-

mental results if kept clean and dry.

• Discharge experiment components before use.

• When the weather is damp, it is advisable to use a

fan.

• Assemble the experiments on the stand and con-

nect to the Wimshurst machine or Van der Graaf
generator with connection chains.

• Observe safety advice.

4. Example experiments

4.1 Discharge from points (Fig.1)

• Place the triskelion wheel (3) on the needle bearing

attached to the stand. Connect to the source of
charge to charge up the wheel.

• The triskelion wheel starts to turn because a jet

of charge flows rapidly out of the points and
propels the wheel.

• Increasing the charge causes the wheel to spin

more quickly.

• The bundle of tissue paper is also a simple elec­troscope.

(Fig. 3)

4.4 Bell chimes (Fig.4)

• Attach the bell chimes (16) to the stand, connect
to the source of charge and gradually increase the
charge until the hammers strike the bells.

• Be careful. Excessive charge can cause sparks be­tween the mountings.

• The supply of charge causes the hammers to
charge up and be attracted or repelled by the bells.

• When the hammers touch the bells, they discharge
and swing back. The process starts again when
they are loaded with the opposite charge.

(Fig. 1)

4.2 Double pendulum (Fig.2)

• A double pendulum made of elder pith (7) is at­tached to the hook stand. Connect to the source
of charge to charge up the pendulum.

• Since the pieces of elder pith assume the same
charge, they repel one another.

• The double pendulum is a simple electroscope.

(Fig. 2)

(Fig. 4)

4.5 Luminous pane (Fig.5)

• Attach the luminous plane (1) to the stand, connect
to the source of charge and gradually increase the
charge.

• When the voltage is large sparks cross the spaces
between the conductors of the pane.

4.3 Bundle of tissue paper (Fig.3)

• Attach the bundle of tissue paper (8) to the stand,
connect to the source of charge and gradually in­crease the charge.

• The strips of paper all repel one another and
spread out to all sides to look like an umbrella
frame.

(Fig. 5)

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