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CREG Journal 80 (0-24)
This issue has a cover date of December 2012, but was published on 14 February 2013.

Front Cover (1)
Andy Snook descending a cascade in Swildons Hole. A 1300 lumen Scurion K was used to light the shot, which demonstrates the effect of sustained illumination discussed in Footleg's article in this issue. Photo: Steve Sharp

Contents (2)
List of Contents and masthead information

Newssheet (3)
Cave Technology Symposium, Check your Waste Bin, Field Meetings

We Hear (4-5)
News and events - Mike Bedford brings us the latest to impact the world of cave radio and electronics. Power from the Air, Energy Scavenging: An Opportunity for Cavers?, The Elektor Design App, Energy Funnels Boost Solar Cell Performance, Spherical Solar Cells, Sub-surface Surveying with Atomic Clocks, New Approach to 3D Scanning, 3D Printing Price Breakthrough, New Amateur Allocation at MF, Paper Batteries.

Low Frequency Amateur Radio (6)
John Rabson summarises the state of play with regard to amateur radio operation in the VLF, LF and MF bands.

Building LED Lights for Cave Photography (7-10)
As an alternative to electronic flash guns, high brightness LEDs now provide an attractive form of lighting for cave photography. In part one of a two-part article Footleg describes some of the benefits of continuous illumination before discussing his choice of LED for use in a practical light for photography and video.

CaveSim Crawls with Electronics (11-12)
Cross a realistic crawl-through cave obstacle course with video game scoring for your caving agility. Dave Jackson explains how CaveSim provides fun and training for novices and cavers alike

An Android Digital Survey Device with no Custom Electronics (13-15)
Looking for a cost effective alternative to the DistoX, Chris Hunter chose to exploit features of an Android smartphone and combine it with a laser distance measure. The design overcomes interfacing issues by employing the smartphone camera and optical character recognition to import distance measurements into the smartphone.

Why Won't Dowsing go Away? (16-19)
In the second part of a two part article on the controversial technique of dowsing, John Wilcock and Geoff Bagley investigate its success in cave detection and describe some recent work aimed at discovering how it might work. (See: Dowsing and the 'Doctrine of Naive Analogy', Letters CREGJ 82 and the expanded letter here, on the CREG Forum).

Dowsing and the Doctrine of Naive Analogy [cregf:viewtopic.php?f=27&t=1187]
Followers of this doctrine, asserts David Gibson, disregard several basic principles of science. They assert that 'any hypothesis has value', and they do not obey the axiom 'Quod supplantandum, prius bene sciendum', or 'Whatever you hope to supplant, you will first know thoroughly'. Instead, they produce hypotheses in ignorance of basic physics, hence the 'Naive Analogy'. (See: Dowsing and the 'Doctrine of Naive Analogy', Letters CREGJ 82 and the expanded letter on the CREG forum, bcra.org.uk/cregf).

Android Underground (20-22)
Mike Bedford looks at the potential uses for Android smartphones and tablets underground and suggests that their inherent durability and low-cost ruggedisation options will lead to much greater use of computers in caves.

Letters to the Editor (23)
3D Photography, Caving Stuff - For Sale, Cave Radio APRS Experiment

Web Watch (23)
Peter Ludwig scans the web looking for interesting titbits. Here's the latest collection.

The Adventures of GREG (24)
Illustrations by Adrian Higgins with words by Mike Bedford.