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11. Electric Incandescent Light and Liquid Gas Incandescent Light als Illuminants for German Lighthouses

Date:
20 Jun 1929
Extent:
1 item
Reference No:
C DPD/1/3/12/5/21

12. French Lighthouse and Beacon Department: Principal modification carried out during 1928 in connection with maritime signalling

Date:
8 Apr 1929
Extent:
1 item
Reference No:
C DPD/1/3/12/5/7

13. Incandescent Lamps for Sea-marks

Date:
20 Jun 1929
Extent:
1 item
Reference No:
C DPD/1/3/12/5/23

14. List of memoranda forwarded with Trinity House letter of 5th April 1929 (B. 4383/1928)

Date:
9 Apr 1929
Extent:
1 item
Reference No:
C DPD/1/3/12/5/14

15. London International Lighthouse Conference, 1929: Communication of the Netherland Lighthouse Service—Application of radio-technique with the Netherland Lighthouse Service

Date:
8 Apr 1929
Extent:
1 item
Reference No:
C DPD/1/3/12/5/13

16. Mersey Docks and Harbour Board: River Mersey &C

Date:
8 Apr 1929
Extent:
1 item
Reference No:
C DPD/1/3/12/5/11

17. Method of Radio Bearings and their employment on the German Coasts

Date:
20 Jun 1929
Extent:
1 item
Reference No:
C DPD/1/3/12/5/24

18. On the range of submarine signals

Date:
8 Apr 1929
Extent:
1 item
Reference No:
C DPD/1/3/12/5/8

19. Physical Principles governing the Design of Sound Signalling Apparatus of large output for use in Air and Water as an Aid to Navigation when visibility is bad by H. Hecht, Kiel

Date:
8 May 1929
Extent:
1 item
Reference No:
C DPD/1/3/12/5/15

20. Progress in aids to navigation in the United States to June 1929–Additional Notes

Date:
20 Jun 1929
Extent:
1 item
Reference No:
C DPD/1/3/12/5/22