English: Variable pitch whistle; note the internal piston used for adjusting pitch
Date
Source
From a 1912 trade catalog.
Author
unknown
Licensing
Public domainPublic domainfalsefalse
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Original upload log
The original description page was here. All following user names refer to en.wikipedia.
2009-05-14 20:20 Steamer405 400×643× (60962 bytes) From a 1912 trade catalog.
2008-02-01 17:34 Steamer405 630×644× (73708 bytes) From a 1912 trade catalog
2008-02-01 17:28 Steamer405 630×644× (76757 bytes) From a 1912 trade cataog.
Captions
Variable pitch whistle; note the internal piston used for adjusting pitch