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# format auto-updated on access: Mon 27-Nov-2017 11:30:00 +01:00 CREG Journal Contents. (This is a bit-map scan). Update Updates on past articles: Survex, Watsonlinc, Alkaline Cells for Lighting, SSB fourth Method, Solar-power Charger, Cell-Zapper, Bibliography. Geophysical Cave Detection, part 2 Phil Ingham summarises the use of seismic, gravitational, magnetic, electrical and electromagnetic techniques. A High-performance Flashgun Slave David Gibson presents a practical design which is compact, has a high range, in insensitive to caplamp beams and consumes a very low current. A Bit of Flash Gear Chris Howes gives some practical hints on using flashbulbs. The State of Cave Surveying A roundup of what has been happening over the last few years by Dave Irwin, together with a reading list. Cave Radio PA Design and a Digital PWM DSB Modulator David Gibson's experimental design. Radio Initiation of Detonators Phil Ingham reveals how to avoid blowing yourself up whilst using radios underground.