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  1. The displacement of an electron beam from its straight-line path by an electrostatic or electromagnetic field.
  2. Shape change or reduction in the diameter of a conduit, produced without fracturing the material.
  3. Elastic movement or sinking of a loaded structural member, particularly of the mid-span of a beam.

Related Terms


The curved shape of the longitudinal centroidal surface of a beam when the transverse loads acting on it produced wholly elastic stresses.


Sudden increase of deflection or twist in a column when compressive stress reaches the elastic limit but before elastic buckling develops.


The delay of certain substances in regaining their original shape after being deformed within their elastic limits. Also known as elastic lag.


  1. The ratio of the effective value of a periodic function, such as an alternating current, to its average absolute value.
  2. A factor that takes the shape of a coil into account when computing its inductance. Also known as the shape factor.
  3. The theoretical stress concentration factor for a given shape, for a perfectly elastic material.


The technique of transporting high-energy, high-current electron beams from an accelerator to a target through a region of high-pressure gas by creating a path through the gas where the gas density may be temporarily reduced; the gas may be ionized; or a current may flow whose magnetic field focuses the electron beam on the target.


A vector partial differential equation for the displacement vector of an elastic solid in equilibrium and subjected to a body force.


Theory of the deformation of a prismatic beam having a length at least 10 times its depth and consisting of a material obeying Hooke's law, in response to stresses within the elastic limit.


It is the difference in displacement in tonnes between the light and loaded conditions. The size of tankers is often given in terms of deadweight tonnage. Ships are usually chartered on the deadweight tonnage.


A device for measuring the speed of water currents in which a perforated disk, which rotates with the current by means of a propeller, is placed in the path of a beam of light that is then reflected from a mirror onto a phototube.


Volume of unoccupied space in a loaded ship due to the irregular shape of the cargo and consequent spaces between.

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