Drill-ground
21Ground-structure interaction — DesignThe interaction between ground and structure consists of an exchange of mutual stress between the structure itself and the foundations ground. This means that the movement of the whole ground structure system is influenced by the type of… …
22ground — 1. noun 1) she collapsed on the ground Syn: floor, earth, terra firma; flooring; informal deck 2) the soggy ground Syn: earth, soil, dirt, clay, loam, turf, clod, sod …
23ground — 1. noun 1) she collapsed on the ground Syn: floor, earth, terra firma; informal deck 2) soggy ground Syn: earth, soil, turf, land, terrain 3) the team s home ground …
24Ground — Grind Grind, v. t. [imp. & p. p. {Ground}; p. pr. & vb. n. {Grinding}.] [AS. grindan; perh. akin to L. frendere to gnash, grind. Cf. {Grist}.] 1. To reduce to powder by friction, as in a mill, or with the teeth; to crush into small fragments; to… …
25drill — n 1. cutting instrument, boring tool, rotary tool. 2. calisthenics, exercise, physical training; gymnastics, slimnastics, aerobics; workout, warm up. 3. teaching, instruction, grounding, training, coaching, drilling; inculcation, indoctrination,… …
26Bow drill — The bow drill is an ancient tool. While it was usually used to make fire, it was also used for primitive woodworking and dentistry. It consists of a bearing block or handhold , a spindle or drill , a hearth or fireboard , and a simple bow .… …
27Oklahoma Drill — The Oklahoma drill[1], also known as the pitt drill is an American football practice technique used to test players in confined full contact situations. Developed by legendary University of Oklahoma coach Bud Wilkinson, the Oklahoma Drill has… …
28Down-the-hole drill — A Down The Hole Drill Called DTH in most drilling terms. The down the hole drill is basically a mini jack hammer that screws on the bottom of a drill string. The fast hammer action breaks hard rock into small flakes and dust and is blown clear by …
29Seed drill — A seed drill is a device for planting seeds in the soil. Before the introduction of the seed drill, the common practice was to broadcast seeds by hand. Besides being wasteful, broadcasting was very imprecise and led to a poor distribution of… …
30Pit drill — A pit drill, also known as an Oklahoma drill, is an football practice technique primarily used as a means of testing players in confined full contact situations.Pit Drills have several variations. The most common involve two players lined up… …
