Appendix D - Leveling Cradle and Spike Kit
The contents of this appendix are applicable to surface vault and posthole models of
Trillium Compact.
D.1 Using the Leveling Cradle
The optional leveling cradle (Nanometrics part number 16863) allows you to accurately level
your seismometer in seconds on installation surfaces that are as much as ±9º outside of level.
The two-sided cradle provides bowls of two depths. The shallow bowl corrects an uneven
surface by up to ±5º and the deep bowl corrects by up to ±9º.
The Trillium Compact rests on three slanted supports that create a bowl shape. Using the
leveling bubble on the top of the case, simply adjust the seismometer on the supports until
the bubble is in the center of the black ring. When using the cradle on its own (without the
spike kit described in Section D.2 on page 97) use the shallow bowl of the cradle to hold the
Trillium Compact. The supports on the deep side of the cradle are designed to act as feet when
the spike kit is not in use.
Figure D-1 - Leveling cradle features and dimensions
Appendix D - Leveling Cradle and Spike Kit
16889R10 • 2020-11-12 Page 96
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