The Structural Engineer > Archive > Volume 12 (1934) > Issues > Issue 11 > Correspondence. Surveying Structures Difficult of Access
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Correspondence. Surveying Structures Difficult of Access

DEAR SIR,-The method of surveying railway bridges, described by Mr. W. P. S. Cockle in The Structural Engineer for September, 1934, records an interesting example of the projection of a point vertically, by the intersection of two vertical planes traced by a theodolite. The following is another example on a larger and more exacting scale: