Watt-hour. A unit of electric energy or work; one watt exerted or expended through one hour.
Waves, Electro-magnetic. Ether waves caused by electro-magnetic disturbances affecting the luminiferous ether.
Welding, Electric. Welding by the use of the electric current.
Wimshurst Electric Machine. An influence machine for producing high potential or static electricity. Thin disks of glass are mounted on insulated bearings and revolved by power. Brushes collect the frictional electricity, which is discharged into a Leyden-jar or other form of accumulator. It is of no practical use excepting in electro-therapeutics.
Wire, Flexible. A cord of fine wire strands laid together and insulated so that it may be easily bent or wrapped.
Wiring. Installing wires so as to form a circuit for the conveyance of current for light, heat, and power.
X
X-rays. A curious phenomenon involving the radiation of invisible rays of light, which have the power to travel through various opaque bodies. The rays are used in detecting foreign substances in the human body and for photographing invisible or hidden objects without disturbing their surroundings.
X-ray Lamp. A high vacuum tube lamp whose interior walls are covered with crystals of calcium or other fluorescent substances, and which, when exposed to the X-rays, give out a luminous light.