File:Instructions-prussian-optic.png

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DescriptionInstructions-prussian-optic.png	Page of an instruction-book for the prussian optical telegraph
Date	1832
Source	Die Telegraphenstation Köln-Flittard. Eine kleine Geschichte der Nachrichtentechnik. Köln, 1973, ISBN 3-933025-19-2
Author	Unknown authorUnknown author

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	21:53, 14 January 2007		800 × 1,137 (405 KB)	Superbass (talk \| contribs)	{{Information \|Description=Page of an instruction-book for the prussian optical telegraph \|Source= Die Telegraphenstation Köln-Flittard. Eine kleine Geschichte der Nachrichtentechnik. Köln, 1973, ISBN 3-933025-19-2 \|Date= 1832 \|Author= unknown \|Permissi

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