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Proceedings Papers

Paper presented at the 1st ISRM Congress, September 25–October 1, 1966
Paper Number: ISRM-1CONGRESS-1966-133
...], A photograph, fig. 1, shows the outer body of the instrument which fits closely into a 3 in, diameter (NX size) drillhole. The forward part of the instrument contains a glass cylinder 1 in. diameter by 1 ½ ins. long which is diametrically loaded between the walls of the borehole by a wedge mechanism...

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