| The primary advantage of an acoustic lens is that it achieves broader dispersion from a small horn, although it can become beamy at high frequencies and it does reduce on-axis sound level.
Loaded wlleel to Longitude
Loaded wlleel to Lock Stitch
ponent connected to output of amplifier or transducer. Also acoustic load offered to loud-speaker by enclosure system. Term sometimes also refers to impedance connected to an input as well as output.
Loaded wheel. A grinding wheel which has a gal zed or clogged surface from particles of the material being ground.
Load factor. (Aero.) The ratio of any specified load on a member to the corresponding basic load generally applied to the ratio of the breaking load to a basic load.
Loading. (PafJermkg.) Pigment or mineral filler used to make paper smoother or more impervious to light.
Load line. Line drawn across a family of anode current/voltage curves of a valve to indicate relationsphip of control grid voltage with anode current, voltage and load.
Loam. (Fdr)'.) A mixture of sand and
clay used in molding.
LQam molds. (Fdry.) Forms built of brick and plastered with a loamclay mortar. These molds which are used mainly for large castings are allowed to dry thoroughly before being poured.
Lobby. (Arch.) A large entrance room in a building. It may serve as a waiting or lounging room as in a
hotel.
Loblolly pine. (Wood) A coarsegrained, soft-fiber pine, with much sap wood; much used in southern United States for framing.
Local action. (Elec.) The chemicalaction in the positive electrode (negative terminal) under the surface of the electrolyte in a primary cell.
Local currents. (Elec.) Also known as Eddy cuments or Foucault currents. (See Eddy currents.)
Local vent. (Plumb.) A pipe or shaft which conveys foul air. from a plumbing fixture or room to the outer air.
Locate. To place in a particular situation or spot; to fix the position or determine the limit of.
Lock. (Fum.) A device for securing a door, lid, etc., so that it can be opened only by a key, or combination.
Locker. (Bldg.) A storage compartment.
Lock-in. (Tel.) The condition existing when the sweep circuits of a television receiver are controlled by the synchronization pulses from the transmitter, resulting in a stationary and clearer picture.
Locking bolts. (Mach.) Bolts of any type used for locking parts in position.
Locking stile. (Carp.) That part of a door to which the lock is attached.
Lock nut. (Mech.) A thin nut screwed down upon another to prevent the slacking back of the main nut.
Lockpin. (Mach.) Any pin or plug inserted in a part to prevent play or motion in the part so fastened.
Lock stitch. A type of stitch accomplished by the use of two threads as in the work done by some sewing machines.
Lockup to Longitude
Lockup. (Print.) Locking up forms for the press.
Lock washer. A split washer with the action of a compression spring; often serves the function of a lock 'nut.
Locomotive. A self-propelled vehicle for pulling trains.
Locust. (Woodwkg.) A hard and very durable wood, used for exposed work. Lode star. A star that shows the way. Lodestone. (Mineral) Natural mag. netic stone; magnetite.
Loess. (Geol.) A fine-grained, claylike soil deposited by wing a~tion in postglacial times. Common in the Mississippi Valley and in
,China. Depth varies from a few feet to about a thousand.
Loft-dried paper. (Papermkg.) Paper which is dried in a drying loft after being surface sized.
Log. (Math.) The logarithm of a number. (Woodwkg.) A piece of timber either rough or squared.
Logarithm. (Math.) The exponent of the power to which a fixed number, the "base", must be raised to produce a given number.
Logic. The science that investigates the prinCiples governing correct or reliable inference.
Loggia. (Arch.) A covered gallery or portico having a colonnade open to the air; usually in the upper part of a building.
Logotype. (Print.) A syllable ora whole word cast as a unit. .
Logwood. (Chern.) The product of a tree native of Central America and the West Indies, Widely used in the dyeing industry and in medicines.
Long. (Cream. and Pot.) Clay which is very plastic and workable.
I..ong column. (Engin.) When the length of a column exceeds its diameter by from 25 to 30 times, it comes under the class of long columns, which yield under pressure by bending alone, in the same manner that a beam supported at both ends will yield.
Longeron. (Aero.) In the framing of an airplane fuselage or nacelle, the fore-and~aft member which is continuous across several points of support.
Long fold. (Papermkg;) Term referring to the fact that a sheet of paper will be folded with the grain if it is folded lengthwise. "Broad fold" is the opposite term.
Longitude. The distance east or west measured from some standard meridian, as that of Greenwich, England.
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