a device fitted to a drill bit to ensure that the hole drilled does not exceed the required depth
an explosive charge designed to be dropped from a ship or aircraft and to explode under water at a preset depth, used for attacking submarines
(in photography) the distance between the nearest and the furthest objects giving a focused image
the ability to perceive the relative distance of objects in one’s visual field
the study of unconscious mental processes and motives, especially in psychoanalytic theory and practice
the arrangement of defensive lines or fortifications so that they can defend each other
an opaque disc, typically white, used to gauge the transparency of water by measuring the depth—known as the Secchi depth—at which the disc ceases to be visible from the surface
an opaque disc, typically white, used to gauge the transparency of water by measuring the depth—known as the Secchi depth—at which the disc ceases to be visible from the surface
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