Using the index finger and thumb
of the right hand, gently move the knurled timing ring so that the
setting mark on the ring turns to the left.
A side view of the inner frame
showing the distinctive 5 and 10 minute timing marks on a model 201
Tropari. The model 211 Tropari has only 10 minute marks. Single dots
on the scale represent 30 minute intervals - double dots 60 minutes.
Timing the Tropari
Remember that the last ten minutes of
the time set on the TROPARI is utilized for the locking cycle. If
you have not reached your survey depth when only ten minutes are
left, the survey will not give meaningful results if you continue to