Dictionary of Engineering

spark-coil leak detectorthrough radio and optical means. { spāskraft used to fasten shielded coils, capacitors, andtrakiŋ }other components to a chassis. { spād bōlt }space detection and tracking system [ENG] spade drill [DES ENG] A drill consisting of threeSystem capable of detecting and tracking main parts: a cutting blade, a blade holder orspace vehicles from the earth, and reporting the shank, and a device, such as a screw, which fastensorbital characteristics of these vehicles to a centralthe blade to the holder; used for cuttingcontrol facility. Abbreviated SPADATS. holes over 1 inch (2.54 centimeters) in diameter.{ spās di¦tekshən ən ¦trakiŋ sistəm }{ spād dril }spaced loading [ENG] Loading shot holes so spade lug [DES ENG] An open-ended flat terminationthat cartridges are separated by open spacersfor a wire lead, easily slipped under awhich do not prevent the concussion from one terminal nut. { spād ləg }charge from reaching the next. { spāst lōdiŋ } spall [ENG] 1. To reduce irregular stone blocksspace frame [BUILD] A three-dimensional steel to an approximate size by chipping with a hammer.building frame which is stable against wind2. To break off thin chips from, and parallelloads. { spās frām } to, the surface of a material, such as a metal orspace lattice [BUILD] A space frame built of latticegirders. { spās ladəs } spalling hammer [ENG] A heavy axlike hammerrock. { spȯl }space processing [ENG] The carrying out of with chisel edge, used for breaking and rough-various processes aboard orbiting spacecraft, dressing stone. { spȯliŋ hamər }utilizing the low-gravity, high-vacuum environmentspan [ENG] A structural dimension measuredassociated with these vehicles. { spās between certain extremities. { span }präsesiŋ }spandrel [BUILD] The part of a wall between thespacer [ENG] 1. A piece of metal wire twisted sill of a window and the head of the windowat one end to form a guard to keep the explosive below it. { spandrəl }in a shothole in place and twisted at the other spandrel beam [BUILD] In steel or concreteend to form a guard to hold the tamping in its construction, the exterior beam that extendsplace. 2. A piece of wood doweling interposed from column to column and marks the floor levelbetween charges to extend the column of explosive.between stories. { spandrəl bēm }3. A device for holding two members at spandrel frame [BUILD] A triangular framing, asa given distance from each other. Also known below a stair. { spandrəl frām }as spacer block. 4. The tapered section of a spandrel wall [BUILD] A wall on the outer surfacepug joining the barrel to the die; clay is compressedof a vault to fill the spandrels. { spanin this section before it issues through drəl wȯl }the die. { spāsər }spanner [DES ENG] A wrench with a semicircu-spacer block See spacer. { spāsər bläk } lar head having a projection or hole at one end.space suit [ENG] A pressure suit for wear in [ENG] 1. A horizontal brace. 2. An artificial ho-space or at very low ambient pressures within rizon attachment for a sextant. { spanər }the atmosphere, designed to permit the wearer spare part [ENG] In supply usage, any part,to leave the protection of a pressurized cabin. component, or subassembly kept in reserve for{ spās süt }the maintenance and repair of major items ofSpace Tracking and Data Acquisition Network equipment. { spār pärt }[ENG] A network of ground stations operated spare-parts list [ENG] List approved by desigbythe National Aeronautics and Space Adminis- nated authorities, indicating the total quantitiestration, which tracks, commands, and receives of spare parts, tools, and equipment necessarytelemetry for United States and foreign un- for the maintenance of a specified number ofmanned satellites. Abbreviated STADAN. major items for a definite period of time. { spār{ spās trakiŋ ən ¦dadə akwəzīshən net ¦pärts list }wərk }sparger See perforated-pipe distributor. { spärspace velocity [CHEM ENG] The relationship jər }between feed rate and reactor volume in a flow sparging [CHEM ENG] The process of forcing airprocess; defined as the volume or weight of feed through water to remove undesirable gases.(measured at standard conditions) per unit time { spärjiŋ }per unit volume of reactor (or per unit weight of spark [ELEC] A short-duration electric dischargecatalyst). { spās vəläsədē }due to a sudden breakdown of air or somespackling [ENG] The process of repairing a part other dielectric material separating two terminals,of a plaster wall or mural by cleaning out theaccompanied by a momentary flash of light.defective spot and then patching it with a plas- Also known as electric spark; spark discharge;tering material. { spakliŋ }sparkover. { spärk }SPADATS See space detection and tracking sys- spark arrester [ENG] 1. An apparatus that preventstem. { spādats }sparks from escaping from a chimney.spade [DES ENG] A shovellike implement with 2. A device that reduces or eliminates electrica flat oblong blade; used for turning soil by pushingsparks at a point where a circuit is opened andagainst the blade with the foot. { spād } closed. { spärk ərestər }spade bolt [DES ENG] A bolt having a spadeshapedspark-coil leak detector [ENG] A coil similar toflattened head with a transverse hole, a Tesla coil which detects leaks in avacuum517