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# htmlentities() run on access: Sun 02-Jun-2019 18:23:05 +01:00. Delete this line to re-run it. # format auto-updated on access: Sun 02-Jun-2019 18:23:05 +01:00 CREG Journal 106 (0-24) This issue has a cover date of June 2019 and was published on 1 June 2019. Front Cover (1) Guy Van Rentergem using his improved smoke generator to visualize the flow of CO2 from the entrance of Cueva de la Muerte (Cave of Death), Costa Rica. Photo: . Contents (2) List of contents and masthead information. CREG Field Meetings. Detecting Gasses Underground: a Practical Guide for Safety and Scientific Study (3-6) considers the types of gasses that might be detected in caves, mines, and other underground spaces, and investigates methods of detection. Carbon Dioxide Data Logging in Caves – Part 2 (7-10) In the second of this short series, and provide full details of their CO2 data logging device, including an electronic circuit diagram and photographs of the physical implementation. Building Blocks (11) Sourcing hardware – balancing value, convenience and quality, by . An Android App using Phone Angle Sensors for Radiolocation Depth Determination (12) introduces the Android phone app that he created, using App Inventor 2, which measures the null angle of a radiolocation loop antenna and thereby calculates the depth from the measured distance to ground zero. An Android Scientific Calculator for Depth Calculation in Radiolocation (13-14) describes his use of an advanced off-the-shelf scientific calculator app for determining the depth in radiolocation exercises. He also discusses the use of an electronic inclinometer to measure the angle of null. Web Watch (14) identifies another collection of interesting sites, which are sure to be of interest to those of an inquisitive disposition... High-speed Data Links over Copper Conductors for Harsh Terrain Applications (15-16) In situations where a high data rate is required, a cabled solution using robust copper cable may be appropriate. & consider a family of products using HSDSL technology providing a range of over 10km. We Hear (17) Roundup of news and events – brings us the latest to impact the world of cave radio and electronics. New Lease of Life for NiMH Batteries, Amateur Radio in the Frequency Basement, Headset Attached to the Back Teeth. BCRA Field Meeting at the British Cave Monitoring Centre (18-19) Based at Poole’s Cavern in Derbyshire, the British Cave Monitoring Centre is now up and running. BCRA arranged a field meeting to introduce this valuable facility for cave science research. , , and outline the day’s events. The Role of GIS in Finding New Caves (20-22) Following his description of how multiple geophysical methods are being used to find new caves, discusses the use of geographical information systems in cave exploration. An Improved Smoke Generator for the Visualization of Airflow in Caves (23-24) Recent methods for visualizing airflow in caves have generally involved aerosol-based ‘haze’ and ‘smoke’ products used in photography and theatrical effects, or simply burning incense sticks. The former cannot be carried on aircraft, and the latter produce too little smoke for visualizing large volumes of airflow. describes a cave-ruggedized smoke generator, based on e-cigarette technology. The Adventures of GREG (24) Illustration by , and words by .