SPLIT FIELD SERVO - DF9 [Main Title]

Film: IWM

988491809
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Description

Object description

Research and information film about CRT (cathode ray tube) radar displays (type DF9).

Full description

Titles have been assembled in the wrong order. They read:

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- 'A record on a map'

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- 'The system responds to the flying controls of a friendly aircraft'

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- 'and an enemy aircraft'

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- 'Split field servo motors are used for remote control'

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- 'Enemy dives'

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- 'Friend climbs'

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- 'Enemy turns right'

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- 'Friend turns left'

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- 'Friend increases speed'

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- 'Variable magnification increases the size of an image on the screen'

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- 'This film is secret'

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- 'Split field servos'

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- 'Motor generator type 73'

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- 'Consists of a split field servo motor with a built in generator'

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- 'The two field yolks'

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- ' . . . are separated by an insulating brass ring'

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- ' On taking the motor to pieces . . '

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- ' . . . we note that the field pole pieces are shaped to prevent "cogging'''

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- ' . . . and to decrease generator ripple'

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- 'On the armature the motor section contains 13 poles'

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- 'The generator section is skew slotted to reduce friction'

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- 'The generator brush-holder is rocked to obtain minimum pick-up'

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- 'The motor brush-holder is rocked to off set permanent magnetism

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- 'Brush pressure is kept to a minimum'

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- 'and is adjusted by a brass screw'

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- 'A Bakelite cap is used as a locking nut'

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- 'Overall friction is about 30gm. x cm'

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- 'On the tag board are . . .'

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- 'Motor field'

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- 'Motor armature'

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- 'Generator field'

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- 'Generator armature'

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- ' In RDF trainer type 19 it is required to co-ordinate during a synthetic Air to Air interception, a projected picture . . .'

Physical description

16mm

Object Details

Category: Film
Related period: Second World War (content)
Creator: Telecommunications Research (Production sponsor)
Telecommunications Research (Production Company)
Production date: 1943-05
Place made: GB
Dimensions: whole: Number Of Items/reels/tapes 1
Catalogue number: TRE 246

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