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 vs. Wet Drowning. In the drowning sequence, laryngeal spasm occurs by water entering the upper airways. In most drowning cases, the spasm relaxes and water enters the lungs. Historically, this was known as a wet drowning. In 10% to 20% of drowning cases, the laryngeal spasm does not relax and no water enters. This was known as dry drowning. It is now felt that there is no clinical difference between wet and dry drowning and the distinction does not affect patient treatment or outcome.