The Spring 1992 CREG Symposium
Peter Eggleston reports.

Emitter Tracks Cave Cracks
Report of a civil engineering application of the Molefone.

The Watsonlinc
David Gibson reviews an inductive device for tapping into telephone cables.

Results of Bosch Drill Battery Duration Tests
Mark McLean has been experimenting with a cordless hammer drill.

How to Lose the Guarantee on your Bosch Drill and Related Horror Stories
Nick Williams provides instructions for the adaption and use of battery-powered drills underground.

A Very Big Flashgun
David Gibson explains how to make a big flashgun by connecting lots of little ones together!.

No-nonsense NiCd Charging
Sensible instructions on the use of rechargeable cells, from David Gibson.

A Battery Discharger
A circuit to safely pre-discharge a NiCd battery before charging, by David Gibson.

Global Positioning Underground
David Gibson explains how inertial navigation might work in a cave-surveying tool.

An Aluminium Tape Antenna
David Gibson outlines his experimental tape antenna, and discusses other designs that might be considered.