Screw clamps. Screw clamps are types which use a screw mechanism to adjust the jaws and clamp a workpiece in place. The types which are found in the screw clamp category include G clamps (also known as C clamps), F clamps, edging clamps, wooden hand screw clamps and rack clamps.
Dry drowning usually happens soon after exiting the water, but with secondary drowning, there can be a delay of up to 24 hours before the person shows signs of distress. Both can cause trouble breathing and, in worst-case scenarios, death.
Dry Drowning: Know the Signs. It sounds scary: A child can seem fine after getting out of a pool or body of water but then start to have trouble breathing an hour -- or up to 24 hours -- later. You'll worry a whole lot less once you know the signs of submersion injuries, and how to prevent them.