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| Bell tapper A British signalman used this instrument to send bell codes to the boxes on either side of him, to check if the line was clear. |
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| Total images: 7 | WWW.DK.COM | Help | |
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| Image | 1 | 2 | 3 | 4 | 5 | 6 | 7 | |
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| Bell tapper A British signalman used this instrument to send bell codes to the boxes on either side of him, to check if the line was clear. |
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| Total images: 7 | WWW.DK.COM | Help | |