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Formula Correction Guide to best practice for the installation of pipejacks and microtunnels The formula on page 50, figure 7, re permissible jacking loads has an error and one of the negative signs is misplaced. The correct formula appears below. Permissible Jacking load

jn ealy sixties arn used a; 'Urn-telling method inc:il-lcilng C. and rractline %blishecl The 'vgchnique and it became practical to use the method