posted by pierdive on Apr 23
David Pogue has an interesting article in the NY Times today called Underwater Photography Made Easy where he reviews two cameras (Sony’s Cyber-shot TX5 and Panasonic’s Lumix TS2) and two undersea camcorders (Panasonic’s SDR-SW21 and Sanyo’s Xacti VPC-WH1.
posted by pierdive on Sep 14
It seems strange to me that someone would have to study the behavior of Basking Sharks for years to determine that they also like to winter in warmer climates but they did. At least that is what a study published in Current Biology on May 7th, 2009.
The red in this picture shows the migratory path these great beasts take throughout the year which looks similar to a lot of New Englander’s I know.
posted by pierdive on Aug 4
Come learn about spearfishing from David Sipperly; three-time All American Freediving Champion, Author, and NAUI Instructor Trainer. Dave’s talk will teach us about the myths and misconceptions of Freediving and Spearfishing and will help answer your questions about technique, safety, and equipment.
WHEN: Wednesday August 12 at 6:30PM.
COST: $30.00
posted by pierdive on Jul 15
Scuba tanks are filled with compressed air. Most of the time this mixture is roughly 21 percent oxygen and 79 percent nitrogen, the same mixture we breathe on land. Tanks may be made out of steel or aluminum and most often hold 80 cubic feet of air at 2000-3000psi. All scuba tanks have a pillar valve which allows a regulator to be connected to the tank and control the air flow.
Aluminum cylinders are less expensive than steel and have been known to last for 20 years with standard regular maintenance. The drawback is that aluminum cylinders they are neutrally buoyant when full, and positively buoyant when nearing empty. This means that as your dive progresses you will spend more time and air to maintain your depth. You will also need to carry more weight.
Steel tanks while being heaver on land maintain negative buoyancy when full and neutral when nearing empty. Some also accept higher pressure fills which will give you more capacity for a longer dive.
All scuba tanks are regulated by the U.S. Department of Transportation and other similar foreign agencies and regulations require that tanks undergo periodic visual inspections and pressure tests.
posted by pierdive on Jun 19
There was a great article earlier this month about a recent study funded in part by the National Science Foundation that says corals “have a genetic complexity that rivals that of humans”. It is worth a read – http://www.cdnn.info/news/eco/e090608.html