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[1] This emphasis on siege warfare led to many developments in the use and design of artillery. Fortifications were vulnerable to vertical trajectory or plunging fire , and the concept of mortars was well understood, but large-scale mortars were initially used only to provide close support for infantry assaults on fortified positions.
Below is a comprehensive drill and tap size chart for all drills and taps: Inch, imperial, and metric, up to 36.5 millimetres (1.44 in) in diameter. In manufactured parts, holes with female screw threads are often needed; they accept male screws to facilitate the building and fastening of a finished assembly.
Albrecht Mortar German Empire: World War I 254: 10-inch siege mortar M. 1841 United States: 1841 254: 10-inch seacoast mortar M. 1841 United States: 1841 260: 26 cm Minenwerfer M 17 Austria-Hungary: World War I 320: 320 mm Type 98 mortar Japan: World War II: 325: Mortier de 12 Gribeauval Kingdom of France: 1781 330: 13-inch seacoast mortar M ...
A cement accelerator is an admixture for the use in concrete, mortar, rendering or screeds. The addition of an accelerator speeds the setting time and thus cure time starts earlier. [ 1 ] This allows concrete to be placed in winter with reduced risk of frost damage. [ 2 ]
In deciding which drill(s) to use it is important to consider the task at hand and evaluate which drill would best accomplish the task. There are a variety of drill styles that each serve a different purpose. The subland drill is capable of drilling more than one diameter. The spade drill is used to drill larger hole sizes.
[7] [8] Mortars: 2-inch Trench Mortar: 2 inch (50.8 mm) United Kingdom: Mortar: 1916–1918 [1] 6-inch Trench Mortar: 6 inch (152 mm) United Kingdom: Mortar: 1917–1918 [1] 9.45-inch Trench Mortar: 9.45 inch (240 mm) France: Mortar: 1916–1918 [1] 3-inch Trench Mortar: 3.209 inch (81.5 mm) United Kingdom: Mortar: 1940–1942 [1] 4.2-inch ...
The kurzer 8 cm Granatwerfer 42 (kz 8 cm GrW 42) was a mortar used by Germany during World War II. It was developed as a lightened version of the standard German 8 cm GrW 34 medium mortar with a shorter barrel for use by paratroopers, but replaced the ineffective 5 cm leGrW 36 as that weapon's shortcomings became apparent.
A 1.5-inch slab of gypsum concrete weighs 13 pounds per square foot versus 18 pounds per square foot for regular concrete. [10] Even though gypsum concrete weighs less, it still has the same compressive strength as regular concrete, based on its application as underlayment or top coat flooring. [ 11 ]