O to octagon
. Oak. (Woodwkg.)A hard, durable, and very strong wood used for many purposes. specially valubale in places where it may be exposed to the weather; also for furniture, flooring, and trim.
Obelisk. (Arch.) A squre monumental shaft with pyramidal top.
Objective. The lens or combination of lenses that first receive the rays from the object and forms the image in the focal plane of the eye piece or on a plate or screen.
Oblique. Slanting, inclined, neither vertical nor horizontal.
Oblique projection. By this system one face of the object is drawn as parallel to the observer, and the faces perpendicular to this front face are drawn at an angle and to the same scale as the front face, while in cabinet projection the lengths would be drawn at half scale.
Oblong. (Math.) A rectangular figure having greater length than breadth.
Obscuration. (Paint.) The covering power of a paint or enamel. The covering of a surface with an opaque paint or finishing material.
Observation. The faculty or habit of observing or noticing.
Observatory. A place or building equipped and used for making observations, astronomical or other natural phenomena esp a domed structure equipped with a powerful telescope for observing the planets and stars.
Obsidian. (Min.) A very hard, glassy,volcanic rock, usually black. Obsolete. Gone out of use. Obstruction light. (Aero.) A red light designed to indicate the position and height of an object hazardous to the operation of aircraft.
Obtuse. (Math.) Not pointed or acute; greater than a right angle.
Obtuse angle. Greater than a right angle; exceeding 90 deg.
Obverse. The face side of a medal or coin; t~e front as opposed to the back.
Occasional furniture. (Furn.) Small furniture of various shapes and uses. In modem times, particularly furniture for the living room and reception hall.
Ocher. (Paint.) A combination of iron and lime formed in marshes by water containing iron in solution. This substance often mixes with clay, and stains it yellow. When dried and ground, this clay forms the yellow ocher of commerce. It is ground to a fine powder and mixed with linseed oil to form paint.
Octagon. A plane figure having eight
Octalle number to Off time sides and eight angles.
Octane number. A designations of antiknock quality, numerically equal to the percentage of isooctane by volume in a mixture of iso octane and normal heptane that matches the given gasoline in an~ tiknock characteristics.
Octane rating. A measure of the antiknock qualities of gasoline. Iso-octane produces the least
knock and is rated at 100. Normal heptane products the most knock and is rated at zero. A fifty-fifty mixture of these two would produce a knock rated at 50.
Octane selector. (Auto.) A scheme for adjusting the timing in order to get maximum efficiency from various grades of gasoline.
Octant. (Aero.) A variation of the aircraft sextant which measures angles up to 90 deg. Its artificial horizon is usually of the bubble type.
Octave. The tone on the eighth degree from a given tone; the interval encompassed by such tones.
Ocular. Of, for, or pertaining to eye or eyes.
Odd legg caliper. (Mach.) Calipers with moderately curved legs, both curved in the same direction, used for measuring shoulder distances, etc.
Odeum. (Arch.) A roofed theater of ancient Greece. In modem usage, a hall, gallery, etc.
Odometer. A device for measuring distance travelled; it is attached to the hub of the whee!:
Odontograph. (Mech.) A table of radii for making or laying off the outlines of gear teeth. Odor. The property of a substance that affects the sense of smell.
0.0. pipe. (Engin.) Indicates outside diameter. Used to designate nominal sizes of boiler tubes, also wrought pipe of over 12 in. diameter. Oersted, Hans Christian. (17771851). Danish physicist noted for discovery of effects of electric current on magnetic needle.
Oersted. (Elec.) The standard unit of intensity of a magnetic field.
Off-center. (Mach.) A term applied to a part which does not. "run true."
Off its feet. (Print.) Type which leans and would not give a sharp impression.
Offset. (Bldg.) A recess or sunken panel in a wall. (Print.) A smudge resulting from carrying too much ink on a sheet. (Steel) Bent out of line in order to clear another structural member.
Offset paper. (Paper.) The prefix "offset", denotes a paper which has properties rendering it suitable for offset Ilthography.
Offset printing. A printing process in which the ink from the form, instead of being transferred directly to the sheet, is first offset on a rubber blanket.
Offset rod. (Auto.) A connecting rod which has a greater length of bearing projecting from one side of the centre line than from the other.
Off time. (Weld.) The time in the resistance-welding process that one or both electrodes are separated from the parts welded.
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