Search results
Results From The WOW.Com Content Network
Charpy test sample with a notch. In mechanical engineering and materials science, a notch refers to a V-shaped, U-shaped, or semi-circular defect deliberately introduced into a planar material. In structural components, a notch causes a stress concentration which can result in the initiation and growth of fatigue cracks.
An advertisement for a Marshalltown Trowel from 1912. The origins of Marshalltown can be traced back to the American inventor and entrepreneur Dave Lennox.While working in his machine shop in the mid-1880s in Marshalltown, Iowa, Mr. Lennox received a visit from a stonemason who asked him to make a better plastering trowel [7] while working on the construction site of the Marshall County ...
A machinist square or engineer's square is the metalworkers' equivalent of a try square. It consists of a steel blade inserted and either welded or pinned into a heavier body at an angle of 90°. Usually a small notch is present at the inside corner of the square.
The square thread form is a common screw thread profile, used in high load applications such as leadscrews and jackscrews. It gets its name from the square cross-section of the thread. [ 1 ] It is the lowest friction and most efficient thread form, but it is difficult to fabricate.
US Bayonet Model 1873 Trowel. In 1870, the U.S. Army introduced the trowel bayonet, intended for individual soldiers as both a weapon and an entrenching tool. [7] [8] [6] This was followed by the development of separate trowel and spade tools, small one-hand implements that could be carried as part of a soldier's individual equipment.
Bricklayer's trowel has an elongated triangular-shaped flat metal blade, used by masons for leveling, spreading, and shaping cement, plaster, and mortar. Pointing trowel, a scaled-down version of a bricklayer's trowel, for small jobs and repair work. Tuck pointing trowel is long and thin, designed for packing mortar between bricks.
The contemporary square drive screw has all but replaced the Robertson screw proper and is commonly referred to as a Robertson because it has practically identical drive dimensions and the same colour identification system, but the contemporary square drive socket has parallel sides rather than tapered.
A 1912 advertisement for a Marshalltown Trowel. The Marshalltown trowel is an excavation implement used by archaeologists around the globe. Manufactured by the Marshalltown Company of Marshalltown, Iowa, the trowel was first introduced in the 1890s. [1] A patent filed for its handle by the company on July 12, 1927 was granted on December 23 ...
Ad
related to: u notch vs square trowel trim youtube