3B Scientific Tyndall's Bar Breaker - Manual

3B SCIENTIFIC® PHYSICS
1
Tyndall’s bar breaker U8442150
Instruction Sheet
06/09 ALF
1 Tensioning screw
2 Abutment
3 Metal bridge
4 Stand rod
5 Bolts
6 Spare bolts
1. Safety instructions
• Set up the experiment so that any pieces of bars
that break and fly off are not able to hit any
nearby people or breakable objects.
• Do not tighten the tensioning screw too much.
• Do not touch the equipment while heating the
metal bridge.
• Allow the equipment to cool before putting it
away.
Caution! Broken bolts will be hot.
• Only pick up broken pieces with the aid of heat-
resistant gloves or a suitable cloth.
2. Description
The bar breaker demonstrates the huge forces that
are involved in a change of volume of solid materials
due to temperature.
The bar breaker consists of a U-shaped abutment
with a metal bridge and a tensioning screw. At the
open end of the fork are two drilled holes through
which cast-iron bolts may be inserted, also passing
through the metal bridge to hold it in place. A rod
attached to the side of the abutment allows the bar
breaker to be attached to a retort stand.
3. Equipment supplied
1 Bar breaker apparatus
10 Cast-iron bolts