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Hairline joint
Smallest possible joint between two edges.
Halation
An effect caused by extreme contrast between the illuminated and unilluminated
portions of a sign and which affects the ability of the eye to focus on
that sign. The effect is also dependent on color.
Halftone
In screen printing, the process of converting images into dots of various
sizes with equal spacing between centers.
Halo
A ring of light. In sign making, the effect achieved by reverse channel letters,
which appear to be ringed by light because the lights source is reflecting
on the background from which the letters are pegged-out.
Halo letter
A type of sign construction where the light generated within the letter or
emblem is allowed to floodlight the surface on which the sign is mounted.
The letter or emblem appears as a dark shape against a lit background. [Click
here to view example]
Hanging sign
A double-faced sign which hangs from a bracket or support and projects from
a wall, building or pole. Also called a projecting sign.
Header
A separate board above the rest of a sign that gives it a headline or contains
a different advertising message for the same product. Most often seen with
point-of-purchase advertising.
H Channel Letter
A dimensional letter with baffles at the center of the cross-sectional shape
for support of neon tubing and mounting of transformers.
High voltage
A voltage exceeding 1000 V a.c. or 1500 V d.c. between conductors, or 600
V a.c. or 900 V d.c. between conductors and earth. Cold cathode or neon
signs operate at up to 10,000 V.
High-reactance transformer
This is sometimes called a "stray-field transformer". It includes a construction
which combines the function of a step-up transformer and ballast.
High-Rise SIgn
A tall freestanding sign.
Hot cathode
An electrode which, during normal operation, has its temperature raised to
a red heat. It is coated with an emissive material and emits electrons by
a process known as thermionic emission. Fluorescent tubes are hot cathode.
Hot cathode lamp
A lamp that uses coils and a ballast such as fluorescent light bulbs. |
