| RGO Archives/RGO 6 contains: |
|---|
| <-- See earlier |
|---|
| 626 |
Time ball and clock statistics |
| 627 |
Papers on telegraphic communications |
| 628 |
Papers on telegraphic communications |
| 629 |
Papers on telegraphic communications |
| 630 |
Correspondence with telegraph companies |
| 631 |
Papers on galvanism and electric clocks |
| 632 |
Papers on galvanism and electric clocks |
| 633 |
Papers on determining galvanic longitudes |
| 634 |
Papers on the galvanic longitude of Brussels |
| 635 |
Papers on the galvanic longitude of Paris |
| 636 |
Papers on the galvanic longitude of Edinburgh |
| See later --> |
|---|
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