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# format auto-updated on access: Mon 27-Nov-2017 11:30:03 +01:00 CREG Journal Contents. (This is a bit-map scan). Field Pattern of a Small Magnetic Dipole David Gibson presents a computer-generated plot of the near and far-fields and the transition-zone between them. (Front cover diagram). A Guide-Wire Communications System Dick Glover gives the background to the early development of cave communications equipment. Digestive Biscuits, FX2s and Abseiling David Gibson muses on biscuits and gravity-powered lighting. Tips for Using Ni-Cd Cells Brief notes on charging and potting of NiCd cells, by David Gibson. Notes on a Laser Gyrocompass Can a gyrocompass be used in an electronic surveying instrument? Notes by David Gibson. Accuracy Problems in Ultrasonic and Light-beam Rangefinders Rangefinders based on 'time-of-flight' measurements may not always be accurate. Notes by David Gibson. Improving Directivity in Ultrasonic Rangefinders David Gibson explains how a parabolic reflector aids focussing. A Laser Rangefinder David Gibson outlines the design of a 'time-of-flight' opto-electronic rangefinder. How Big Should a Loop Antenna Be? Loop antennas do not necessarily need to be large; what is important is the signal/noise ratio. David Gibson investigates. Uniform Survey Data Stuart France invites a discussion on a standard format for recording survey data. Reviews Phil Ingham reviews some survey drawing packages and a paper on KIS.