|  | G |
SECTION G — PHYSICS

INSTRUMENTS

|  | G04 |
HOROLOGY

|  | G04F |
SHORT TIME-INTERVAL MEASURING, e.g. PRECISION SYSTEMS (in radar or like systems Fulltext... Hierarchy... Expanded...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 Fulltext... Hierarchy... Expanded...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 Fulltext... Hierarchy... Expanded...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 Fulltext... Hierarchy... Expanded...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