Zero control knob
5. Optical scale
6. Macro weight scale
Micrometer drum knob
7. Weight control knob
Figure 2-28. Analytical Balance.
(1) From time to time clean the weights of the balance with a camel's hair brush or chamois leather. To
remove the weights, arrest the beam and take off the hood. Move all knobs to the maximum setting. Remove the
weighing pan from the weighing compartment. Lift the weight carriage and swing the weight carriage bridle forward to
detach it from the bearing (stirrup) plate. Unscrew two large knurled head screws in the ceiling on the weighing
compartment and remove the partition. Unscrew knurled knob (5, fig. 2-30), and knurled nut (4). Separate the upper
part of the weight carriage from the lower, while holding the lower to prevent it from falling into the weighing
compartment. Take out the lower part and switch the weight decade slowly from 9 to 8 to 7, etc., to zero. While doing
this, remove the corresponding weights which will be lying freely in their respective hooks. Clean the weights thoroughly.
Do not leave fingerprints on the surface. Handle weights with forceps only. After cleaning, reassemble the balance
check, zero, calibrate, and adjust sensitivity, if necessary.