W-truss: A truss having upper and lower chords joined by web members that form a shape resembling the letter W.
Wacker process: A process for the oxidation of ethylene to acetaldehyde by oxygen in the presence of palladium chloride and cupric chloride.
Walter engine: A multirotor rotary engine that uses two different-sized elliptical rotors.
Walley engine: A multirotor engine employing four approximately elliptical rotors that turn in the same clockwise sense, leading to excessively high rubbing velocities.
Wankel engine: An eccentric-rotor-type internal combustion engine with only two primary moving parts, the rotor and the eccentric shaft, the rotor moves in one direction around the trochoidal chamber containing peripheral intake and exhaust ports. Also known as rotary-c
Wanner optical pyrometer: A type of polarizing pyrometer in which beams from the source under investigation and a comparison lamp are polarized at right angles and then passed through a Nicol prism and a red filter, the source temperature is determined from the angle through which
Ward-Leonard speed-control system: A system for controlling the speed of a direct-current motor in which the armature voltage of a separately excited direct-current motor is controlled by a motor-generator set.
Warren truss: A truss having only sloping members between the top and bottom horizontal members.
Watson factor: NULL
Watt's law: A law which states that the sum of the latent heat of steam at any temperature of generation and the heat required to raise water from 0°C to that temperature is constant, it has been shown to be substantially in error.
Weber number 3: A dimensionless number used in interfacial area determination in distillation equipment, equal to the surface tension divided by the product of the liquid density, the acceleration of gravity, and the depth of liquid on the tray under consideration. Symbo
Wentworth quick-return motion: NULL
Weston standard cell: A standard cell used as a highly accurate voltage source for calibrating purposes, the positive electrode is mercury, the negative electrode is cadmium, and the electrolyte is a saturated cadmium sulfate solution, the Weston standard cell has a voltage of
Westphal balance: A direct-reading instrument for determining the densities of solids and liquids, a plummet of known mass and volume is immersed in the liquid whose density is to be measured or, alternatively, a sample of the solid whose density is to be measured is immer
Wheatstone bridge: A four-arm bridge circuit, all arms of which are predominately resistive, used to measure the electrical resistance of an unknown resistor by comparing it with a known standard resistance. Also known as resistance bridge, Wheatstone network.