G
SECTION G — PHYSICS
  
INSTRUMENTS
 G04
HOROLOGY
 G04F
SHORT TIME-INTERVAL MEASURING, e.g. PRECISION SYSTEMS (in radar or like systems G01S)
 G04F 1/00
Apparatus which can be set and started to measure-off predetermined or adjustably-fixed time intervals without driving mechanisms, e.g. egg timer (electric time or time-programme switches H01H 43/00)
 G04F 1/02
·  by consuming prefixed quantities of materials, e.g. by burning candle
 G04F 1/04
·  by movement or acceleration due to gravity
 G04F 1/06
·  ·  by flowing-away of a prefixed quantity of fine-granular or liquid materials, e.g. sand-glass, water-clock
 G04F 1/08
·  ·  by a body falling a prefixed distance in air or in a viscous material
 G04F 3/00
Apparatus which can be set and started to measure-off predetermined or adjustably-fixed time intervals with driving mechanisms, e.g. dosimeter with clockwork (electric time or time-programme switches H01H 43/00)
 G04F 3/02
·  with mechanical driving mechanisms
 G04F 3/04
·  ·  Additional arrangements in connection with ordinary non-electric clocks for this purpose
 G04F 3/06
·  with electric driving mechanisms
 G04F 3/08
·  ·  Additional arrangements in connection with ordinary electric clocks for this purpose
 G04F 5/00
Arrangements for producing preselected time intervals for use as timing standards
 G04F 5/02
·  Metronomes
 G04F 7/00
Apparatus for measuring unknown time intervals by non-electric means (electric starting or stopping G04F 9/06)
 G04F 7/02
·  by measuring the distance of fall or the final velocity of a falling body
 G04F 7/04
·  by clockwork
 G04F 7/06
·  ·  running only during the time interval to be measured, e.g. stop-watch
 G04F 7/08
·  ·  Watches or clocks with stop devices, e.g. chronograph
 G04F 7/10
·  ·  Mechanical means used apart from the time-piece for starting or stopping same
 G04F 9/00
Apparatus for measuring unknown time intervals by electric means or by electric control of non-electric timepieces
 G04F 9/02
·  by continuously-running electric driving mechanisms
 G04F 9/04
·  Electric stop watches running only during the time intervals to be measured
 G04F 9/06
·  Electric means for starting or stopping electric or non-electric timepieces
 G04F 11/00
Precision systems for measuring short time-intervals
 G04F 11/02
·  by using mechanical oscillators
 G04F 11/04
·  by using electrochemical oscillators
 G04F 11/06
·  by using oscillatory electric circuits
 G04F 11/08
·  by counting pulses or half-waves of alternating current
 G04F 11/10
·  by measuring phase-change of electric waves
 G04F 11/12
·  by optical means