(20 12? Suining) According to the physical laws reflected in Figure A, people invented the _ _ _ _ machine; As shown in Figure B, when doing the Torricelli experiment, when the glass tube is tilted,

(1) From the analysis on the left, it is not difficult to see that this circuit has no power supply. After the switch is closed, when the metal bar ab cuts the magnetic induction line in the magnetic field, the ammeter pointer will deflect. This is an experimental device of electromagnetic induction, and a generator made by using this principle.

(2) In the Torricelli experiment, the height of mercury column refers to the vertical height from the mercury surface in the tube to the mercury surface in the mercury tank. This height is determined by the external atmospheric pressure, so it will not change because of inclination. Now the length of the mercury column after the glass tube is tilted is 76 cm, so the height of the mercury column is less than 76 cm, and the external atmospheric pressure is less than a standard atmospheric pressure.

So the answer is: power generation; Less than.