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Tachymeterskala
Med tachymeterskalaen kan man aflæse den kørte gennemsnit-
shastighed en defineret lestrækning. Skalaen svarer til en
tilbagelagt strækning på en kilometer.
Start tidtagningen ved strækningens begyndelse ved at trykke
start/stop-knappen (7). Stop tidtagningen efter en kilometer ved at
trykke én gang til start/stop-knappen (7). Den gennemsnitlige
hastighed kan da aflæses på skalaen ved sekundviseren.
Eksempel: De er PASSAGER i en bil, der kører på en motorvej.
Kantpælene danske motorveje er normalt opstillet i en afstand
100 m. Start stopuret ved en kantpæl, og stop det ved den tiende kant-
pæl, der passeres (på tyske motorveje er afstanden mellem kantpælene
50 m, og der skal så stoppes efter den tyvende). Sekundviseren viser nu
gennemsnitshastigheden.
Hvis strækningen er tilbagelagt
på 30 sekunder, er gennemsnits -
hastigheden 120 km/h.
Telemeterskala
Med telemeterskalaen kan man måle den omtrentlige afstand i kilo-
meter til lysobservationer, f.eks. et lynnedslag.
Start tidtagningen ved at trykke på start/stop-knappen (7), når glimtet
fra lynet ses. Så snart braget høres, trykkes igen på start/stop-knappen
(7). Nu kan afstanden til tordenvejret aflæses i kilometer på telemeter-
skalaen.
Eksempel: Hvis stopsekundviseren bliver stående "2” telemeter-
skalaen, er tordenvejret 2 km væk. (2000 m: 334 m/s = 5,99 sekunder =
telemeterskala ”2”).
Da lyset udbredes med lysets hastighed, er den tid, som glimtet fra
lynet bruger for at nå hen til Deres posi-
tion, forsvindende lille.
Tordenbraget derimod udbredes med
lydens hastighed, altså med ca. 334 m/s
(ved ca. 5° lufttemperatur).
35


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