1940s railroad switchman demonstrating a lantern hand signal.
https://diqn32j8nouaz.cloudfront.net...ted_signal.jpg
More:
http://www.rgusrail.com/manual/baker...aker_fpi_1.pdf
Previously:
https://www.homemadetools.net/forum/...430#post158446
https://www.homemadetools.net/forum/...564#post139437
https://www.homemadetools.net/forum/...932#post156691
