Mystery of white marks

Can anyone explain these mysterious white marks? PICTURE: PAUL COSTEN
Can anyone explain these mysterious white marks? PICTURE: PAUL COSTEN
jpns-19-08-17 retro Aug 2017

Victory - Passengers line the rails of Viking Victory

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This intriguing aerial picture of Southsea Castle shows a funfair and a few people promenading along the sea wall.

But can any of you explain the white marks which appeared on the original photograph.

What are they obliterating? Anti-aircraft gun emplacements?

It looks as though the picture, from Waterlooville collector Paul Costen, might have been taken during the phoney war in the autumn of 1939, or perhaps even during the Second World War.

Can anyone put a date on it and explain the mystery of the white marks?