The whole of the rod will therefore be subject to a **compressive** longitudinal stress P, the associated contraction R, expressed as a fraction of the original length, being R = P/M = (B 2 -H2)/87-M, where M is Young's modulus.

4 Some writers have indeed contended that the stress in magnetized iron is not **compressive**, but tensile, even when, as in the case of a ring-magnet, there are no free ends.

Rowland in support of **compressive** stress.

The maximum **compressive** working stress on the concrete may be 500 lb per sq.

Folding of the rocks resulted from the operation of great **compressive** forces acting tangentially to the figure of the earth.

The deformation of the Appalachianswas accomplished in two chief periods of **compressive** deformation, one in early Palaeozoic, the other about the close of Palaeozoic time, and both undoubtedly of long duration; the second one extended its effects farther northwest than the first.

The safe tensile strength of Portland cement concrete would be something like one-tenth of its **compressive** strength, and might be far less.

It has considerable **compressive** or crushing strength, but is somewhat deficient in shearing strength, and distinctly weak in tensile or pulling strength.

Such composite structures take advantage at once of the high tensile strength of iron and of the high **compressive** strength of cement mortar.