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CREG Journal 87 (0-24)
This issue has a cover date of September 2014 and was published on 1 September 2014.

Front Cover (1)
The ooLiTE in action, thermoelectric cave lighting. Photo: Andy Lillington

Contents (2)
List of Contents and masthead information.

Low-Power, Low-Cost Data Logger and Rain Gauge (3-5)
Having experienced rapidly increasing water flow in conditions of only light rain, Chris Hunter decided to develop an ATmega328-based data logger and rain gauge to enable more detailed study.

We Hear (6,18)
News and events - Mike Bedford brings us the latest to impact the world of cave radio and electronics, including The Ultimate Emergency Lamp, LORAN to Return to the USA?, New Inertial Navigation Development, Amateur VLF Spans Atlantic, Introducing SmartMic, Low-cost Laser Scanners Make their Appearance.

South African Show Cave Communication System (7-9)
A wireless communication system has recently been installed in Cango Caves, a major tourist attraction in South Africa. Sean Mervitz of Global Communications describes the system and the benefits on offer to management and guides.

Web Watch (9)
Further unusual links from Peter Ludwig, as he probes the Internet for interesting snippets...

The ooLiTE: Thermoelectric Lighting for Cavers? (10-15)
Andy Lillington describes the construction of a low-cost thermoelectric generator using a bismuth telluride Seebeck Effect module. It is able to power a high-output LED from a modest heat source and produce hot water as a side benefit. He also considers the possibility of powering a light directly from human body heat.

Upgrading Caving Lamps the Easy Way (16-18)
Several products on the market make it possible for you to upgrade your old caving lamp without having to design the electronics or engineer a cave-proof housing yourself. Mike Bedford provides a roundup of LED modules that can replace filament bulbs and lithium-ion battery packs to substitute for lead-acid batteries.

Letters and Notes (19)
Diary Dates, Cavemite, Battery Case, Field Meeting.

Introducing NMR Geophysics (20-22)
Mike Bedford and John Rabson describe the principles behind a geophysical technique that involves nuclear magnetic resonance. The method has potential for finding water-filled caves, as an exercise in southern France confirmed.

GSM Underground (23-24)
Fabrizio Marincola has been using a leaky feeder system to provide cave to surface communications for some time. He describes how he has added the ability to extend GSM telephone connectivity into the cave, employing the same leaky feeder cables.