1. A surveying instrument with a telescope and bubble tube used to take level sights over various distances, commonly 100 feet (30 meters).

2. To make the earth surface horizontal.

A specified position on an amplitude scale applied to a signal waveform, such as reference white level and reference black level in a standard television signal.

1. The status of a data item in COBOL language indicating whether this item includes additional items.

2. See <<channel>>

A device consisting of a bubble tube that is used to find a horizontal line or plane. Also known as spirit level.

A single bank of contacts, as on a stepping relay.

1. The difference between a quantity and an arbitrarily specified reference quantity, usually expressed as the logarithm of the ratio of the quantities.

2. A charge value that can be stored in a given storage element of a charge storage tube and distinguished in the output from other charge values.

1. Mine workings that are at the same elevation.

2. A gutter for the water to run in.

In factorial experiments, the quantitative or qualitative intensity at which a particular value of a factor is held fixed during an experiment.