Direct drive to Disinfection.

Directdrive. (ELec.) A compact arrangement of driving a dynamo

Direct dyes. (Textile) Dyes which are effective without the use of a mordant.
Direct feed. Refers to an audio path where the signal is routed from one point directly to another without passing through additional ampli­fiers or signal processors. A direct feed from a mixing console gener­ally' refers to a feed from each mixing point (channel), usually af­ter the preamp and equaliser, that is applied directly to another point without going through the con­sole's submaster and/or master mixing busses as normal.
Direct indexing. (Mach.) Direct in­dexing on the milling machine is done in such a manner that the spindle and the work mounted thereon revolve through identical angles with the indexing plate.
Direction. The position of one point in relation to another.
Directional. Applied to microphone, antenna or loud-speaker; having by direct connection with a prime mover or the. load, avoiding the use of shafts and belts.greater sensitivity or output in a particular direction.
Directional gyro. (Aero.) A gyro­scopic instrument for indicating direction, containing a free gyro­scope which holds its position in azimuth and thus indicates angu­lar deviation from the course.
Direct radiator. A loud-speaker which is not horn loaded. usually refers to a cone-type loud-speaker as opposed to a compression driverlhorn assembly.
Directional radio. Radio transmis­sion in which the radio energy. is radiated from the antenna in a cer­tain predetermined direction.
Directional stability. (Aero.) Stabil­ity with reference to rotations about the normal axis; i.e., an airplane possessed directional sta­bility in its simplest form if a re­storing moment comes into action when it is given a small angle or yaw. Owing to symmetry, direc­

Direction of force. (Phys.) Is deter­mined by the direction the force moves or tends to move the body upon which it acts.
Direction of magnetic flux. (Elec.) The direction is always from the north to the south pole in a mag­netic field.
Direction signal. (Auto.) An electri­cal device used on trucks and buses to indicate the direction In which the driver intends to turn.
Directivity factor. For a loud-speaker, this is measurement of how much the speaker focuses the sound in a given direction. Directivity is measurd by taking the ratio of the average sound level in front of the speaker (at a given distance and frequency).
Director. Element in VHF antenna system placed in front of main di­pole to improve sensitivity in for­ward direction.
Direct radiation. (phys.) When the heating of a room is effected by steam or hot-water radiators within the room, the method is called direct radiation.
Dirigible. (Aero.) That which can be directed or is steerable, as a dirigible balloon. A noun to indicate an air-ship.
Dirty. (Print.) To "dirty" ink means to make it darker.
Dirty proof. (Print.) A proof that con­tains many errors.
Discharge header. (Aero.) The ductthrough which the air is conducted from the supercharger to the en­g: ie.
Discharging or relieving arch. (Mu.­sonry) An arch over the opening of a door or window to relieve the weight from the lintel.
Discolouration. (Plast.) Any change from an initial colour possessed by a plastic.. A lack of uniformity in colour where colour should be uni­form over the whole area of a plas­tic object. In the latter sense, where they can be applied, use the more definite terms "mottle, segregation. or two-tone."
Disconnect. To unfasten, release, or separate from.
Discriminator. Detector in FM re­ceiver. Extracts audio modulation from IF signal.
Disengage. To disconnect; to remove or separate from so as to free from action.
,. Disengaging clutch. (Mach.) A clutch for the throwing of a line of shafting or a train of wheels into and out of gears.
Dished. Symmetrical departure from flatness of disc record, giving sacuer like shape with central re­gion displaced from plane of pe­riphery.
Dished wheel. (Auto. Mech.)A wheel make concave or convex.
Disinfectant. (Chern.) A gas, liquid, or solid used to destroy disease germs.
Disinfection. (Chern.) The act of dis­infecting or destroying germs ofinfectious or contagious diseas

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