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21. Statistical notes and Summary sketches of the Works regarding the aids to Navigation in Japan (1926–28). Lighthouse Board, Japan

Date:
8 May 1929
Extent:
1 item
Reference No:
C DPD/1/3/12/5/19

22. The Character and Power of the Beam from Lighthouse Apparatus by W. M. Hampton

Date:
8 May 1929
Extent:
1 item
Reference No:
C DPD/1/3/12/5/18

23. The Radio Direction Finder

Date:
8 May 1929
Extent:
1 item
Reference No:
C DPD/1/3/12/5/16

24. The production of liquid gas for use in lighting apparatus

Date:
8 May 1929
Extent:
1 item
Reference No:
C DPD/1/3/12/5/17