Stock Photo - Sep. 09, 1968 - Strengthening the white cliffs.: With a fine view of Dover Harbor in the background, Mr. Dennis Smith, 29, of Dover and Mr. Graham Barker (right), 32, of Sheffield, prying loose chalk and flints from the face of the 'White Cliffs', They are undertaking the first stage in an operation to lessen the constant danger of falls caused by erosion and water see page. Marples Ridgway and Sir William Halcrow and Partners, consultant engineers, under contract to the Ministry of Public Building and Works, are working on about half a mile of the worst affected section, part of the boundary of Dover Castle. Sixty-four bolts up to 25ft. long have been set in concrete in the cliff face to secure the surface sections to firm bedrock. Each bolt has been checked at the outward end with a Horstman tension meter, a small cylinder of glass which discloses changes in stress when viewed by polarised light. No changes have been recorded since the bolts were installed a month ago. (Credit Image: © Keystone Press Agency/Keystone USA via ZUMAPRESS.com)

Stock Photo: Sep. 09, 1968 - Strengthening the white cliffs.: With a fine view of Dover Harbor in the background, Mr. Dennis Smith, 29, of Dover and Mr.

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