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.
Drowning from fluid in the lungs that occurs not during submersion in water, but up to 24 hours after swimming or bathing, defines secondary drowning, says Dr. Fisher. If the child inhales water into the lungs, the vocal cords can spasm. The drowning is defined 'dry' because it occurs out of the water..