Tones

A series of two or three musical notes, used as an auditory alert over a radio or radio-paging system to indicate that a particular fire company, district, or territory is dispatched to service on a particular incident.
Found on http://en.wikipedia.org/wiki/Glossary_of_firefighting_equipment

Tones

A series of two or three musical notes, used as an auditory alert over a radio or radio-paging system to indicate that a particular fire company, district, or territory is dispatched to service on a particular incident.
Found on http://www.translationdirectory.com/glossaries/glossary102.htm

Tones

Refers to the strength of grays between white and black. It relates to the brightness, lightness and darkness of the subject and is determined by illumination
Found on http://www.encyclo.co.uk/local/21048

Tones

Refers to the strength of grays between white and black. It relates to the brightness, lightness and darkness of the subject and is determined by illumination.
Found on http://www.rodsmith.org.uk/photographic%20glossary/rods%20photographic%20gl
No exact match found