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.
Secondary Drowning: What It Is. Secondary drowning, also known as delayed drowning, is extremely rare but can be fatal if you overlook the symptoms. Anytime a liquid (like water, after a near-drowning experience) gets into the lungs, it can cause irritation. The body sometimes then sends fluids from other areas to the lungs in hopes of helping out. But instead of helping, the fluids leave little to no room for breathing, which can cause cardiac arrest or death. Secondary drowning can happen minutes or up to three days after the water first got into the lungs.