OPTO EDU E12.0127 Solid Expansion Apparatus

The utility model thermal expansion and contraction demonstrator includes a rotating foot, a board surface, a rotating shaft, a
pointer, a fixing bolt, a metal bar, etc., and is characterized in that one end of the metal bar is made into a hook and lock
shape, and it is fixed on the bolt on the board surface. The pointer Installed on the rotating shaft, one end of the indicating
scale is longer, the end connected to the metal bar is extremely short, and the other end is locked in the ring at the bottom end
of the pointer. The swelling is displayed enlarged by the pointer. The rotating foot is installed on the lower end of the board
surface to support it, and it can be rotated. It is perpendicular to the board surface when in use, and rotates to the same plane
as the board surface when not in use. It does not take up space and is stored. If you design a circuit on the demonstrator,
connect a horn or indicator light, the pointer will turn to a certain angle, and the power will be turned on to make it sound or
emit light. It can be used as a "fire alarm", when the temperature of the metal strip drops to before the experiment At the
starting temperature, the pointer returns to zero scale