“One of the most effective repellants WorldMags.net exploits the electric sensitivity of
TECHNOLOGY
the shark’s ampullae of Lorenzini”
What is shark repellant? Learn about the clever technology being developed to keep sharks at bay Shark repellant technology is still a work in progress to some extent, but there are two main proven methods to keep sharks at bay. These predatory fish will stay well clear of other dead sharks when they smell them, and scientists have isolated the chemical source of the odour to several compounds, like copper sulphate. There are also examples of prey taking advantage of the shark’s sensitivity to certain smells, such as the Moses sole, which produces a soap-like substance called pardaxin that sharks hate. One of the most effective repellants so far, though, exploits the electric sensitivity of the ampullae of Lorenzini on the shark’s nose, which it uses to detect prey and navigate. The device creates a local elliptical electric field that employs a particular waveform that all sharks are sensitive to. This causes uncomfortable (but not harmful) spasms in their snouts that intensify the closer they move to the source, ultimately forcing them to turn away.
Shark repellant in action
Surf’s up
See how surfers might benefit from one of these anti-shark gizmos
Surfers, divers, kayakers and more are vulnerable to shark attack, but devices like this offer a humane way of keeping the fish away.
Deterrent Electrode Two electrodes must be submerged in the water for the repellant to work.
Personal CNC for Home or Hobby Don’t Let Your Tools Hold Back Your Creativity Tormach Personal CNC machines are the ultimate workshop tool. Whether you’re a jeweler, artist, prototype builder, engineer, model maker or hobbyist, a Tormach PCNC will expand your possibilities and enable your ideas. Steel Clutch Plate for Reproduction The PCNC 1100 Features: ■
3-Axis CNC Milling Machine cuts aluminum, steel, plastic, wood and more
■
Table size 26” x 8”
■
5000 RPM computer-controlled spindle
■
Stiff cast iron frame
■
Space-saving footprint
■
Requires single-phase 230VAC 50/60Hz electrical service
■
Optional accessories: Reverse Engineering CNC Scanner, 4th Axis, Digitizing Probe
Electric field
Sharks entering the range of the field experience increased discomfort the closer they get to the source, so swim away.
Case 65 Steam Traction Engine machined with the PCNC 1100
3-Axis Mill
www.tormach.com
$8480
USD (plus shipping)
WorldMags.net
The device emits an electric field up to 8m (26ft) around the user.
Shown here with optional stand, LCD monitor, machine arms, and accessories.
