A3.2.3.1 To charge the Cannon-Fenske opaque viscometer,
invert the viscometer and apply suction to the tube L, immersing
tube N in the liquid sample. Draw liquid through tube N,
filling bulb D to filling mark G. Wipe any excess sample off
tube N and invert the viscometer to its normal position. Mount
the viscometer in the constant temperature bath, keeping tube
L vertical. Close tube N with a rubber stopper or a short length
of rubber tube with a screw clamp.