Standard beam balance for student laboratory use up to 250 gm. A rider on the left arm can measure to one milligram.
Transcription of handwritten instructions.
BEAM BALANCE
Operation:
1. Check that the balance is level - adjust left and right feet until the tip of the plumb bob is centred in the dimple.
2. Rotate the front centre knob - with door down - clockwise gently raising the beam. Observe swings and determine MICROID scale mark which coincides with the centre of the swing.
3. Raise door 2/3 way up, where it should stay.
4. Place object on left pan.
5. Using tweezers - not fingers - add masses to right pan when beam is lowered.
6.Raise beam to check balance, then lower. Add masses and recheck.
7. Continue 5,6 until beam balances ......the rest is illegible
