FIGURE 9:
COUNTING A SAMPLE MOUNTED ON A SLIDE

this operation is tedious and time
_ consuming
slide with sample

right hand is being used for field
selection

| eounter for number of fields counted
_ and for number of fibres counted

FIGURE 10:
SAMPLING
Pump is turned on while operator traverses

the sampling location

filter facing downwards with open face
in the operator's breathing zone

stopwatch for sample time

portable pump hung on the belt

“4 Here the operator is ready to start
4 the pump