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L-LINES

Characteristic X-ray frequencies from atoms due to the excitation of electrons from the L-shell. Denoted by La, L [i, ...; the lines are multiplets.

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L-REST

A lathe rest used in hand turning, shaped like an inverted L.

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L-RING

A method of tuning a magnetron.

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L-SHELL

The electron shell in an atom corresponding to a principal quantum number of two. The shell can contain up to eight electrons. See panel on Atomic structure.

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L/D RATIO

Property of an injection moulding screw or extrusion screw, defined by ratio of screw length to flight diameter. It is typically 20-30 to 1 for thermoplastics and 5-10 to 1 for rubbers. See extrusion,

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LA ANTIGENS

Class II histocompatibility antigens with functions similar to human HLA-D antigens on mouse B- cells. macrophages and accessory cells.

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LA POINTE PICKER

Small belt conveyor on which ore is so displayed that radioactive pieces are removed as they pass a Geiger-Miiller counter.

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LABEL

A projecting moulding above a door or window opening.

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LABEL-CORBEL TABLE

A dripstone supported by a corbel.

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LABELLED ATOM

Atom which has been made radio

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