delay-action

The Canadian Engineers repairing the line had removed a great many bombs, but about three days after the arrival of D.H.Q. a delay-action mine went off on the railway at 7.30 p.m., and two days later again at 7 a.m.

A Short History of the 6th Division Aug. 1914-March 1919 Thomas Owen Marden

Bohain had been cratered at their exits from the village, and delay-action mines on the railways were constantly going up.

A Short History of the 6th Division Aug. 1914-March 1919 Thomas Owen Marden

But on a larger scale the enemy's very clever system of working his delay-action mines on the railways, was the biggest nuisance we had to contend with.

The Sherwood Foresters in the Great War 1914 - 1919 History of the 1/8th Battalion W. C. C. Weetman

In a few cases delay-action mines had been laid, which did not explode for some little time.

The Sherwood Foresters in the Great War 1914 - 1919 History of the 1/8th Battalion W. C. C. Weetman

If the submarine be under water, and its presence betrayed by the peculiar surface-ripple that marks its wake, a bomb with a delay-action fuse can be dropped upon it, the projectile not exploding until it reaches a depth of fifty feet or so.

Kelly Miller's History of the World War for Human Rights Kelly Miller 1901