Despite his incredible evidence for continental drift, Wegener never lived to see his theory gain wider acceptance. He died in 1930 at age 50 of a probable heart attack while on a scientific expedition in Greenland.
drill press - a machine tool with a separate, upright stand; an electric drill is pressed into the work automatically or with a hand lever. 1  electric drill - a rotating power drill powered by an electric motor. 2  machine tool - a powered machine for cutting or shaping or finishing metals or other materials.
(November 2014) (Learn how and when to remove this template message) (Learn how and when to remove this template message) A hydraulic valve lifter, also known as a hydraulic tappet or a hydraulic lash adjuster, is a device for maintaining zero valve clearance in an internal combustion engine. Conventional solid valve lifters require regular adjusting to maintain a small clearance between the valve and its rocker or cam follower.