tone

3 photos tagged tone, from 3 members of Flickr Commons.

When were these photos taken?

1
1906
2008

 

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33% of these photos are geotagged.

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23_0066884 Convair Negative Image

from SDASM Archives

  • Chuck Walla said:
    SELCAL is a contracted form of selective calling. It uses an international standard tone signaling system that is almost identical to a Motorola fire station alerting system called Quik Call. For over ocean operations, for example, it allows flight crew to mute the radio so it's not necessary to listen to aircraft hundreds of miles away. If air traffic contol needs to speak with you, the SELCAL lights and the radio buzzes or beeps.

Sgt. Bennett, mechanic ; Keith Smith ; Ross Smith ; Sgt. Shiers, mechanic (left to right), on Sydney Town Hall steps after first UK-Australia flight, 14 Feb 1920

from State Library of New South Wales

  • entertaining industry said:
    hahaha photobomb!