Projection Devices, Continued
Slide projectors have many accessories to create a custom system that works
for your needs. Slide trays hold slides in sequence, locked into place, in
increments from 60 to 180 slides. Stack loaders allow the rapid loading and
the easy rearrangement of slides. Remote control cords with connections of
varying lengths allow the operator mobility during presentation. These
remotes signal the projector to go forward, in reverse, and to power focus.
Variable focus lenses are available in long and short ranges to minimize
distortion in unusual presentation situations.
One accessory that contributes to a professional presentation is a dissolve
unit. Most dissolve units are multi-functioning; that is, they fade an image
into black or into another image, or have flashing or overlay capabilities.
One or more projectors change an otherwise static presentation into a
Programmers offer the operator an opportunity to code a series of functions
or special effects into their slide presentation. Common special effects
programmers include the following:
AUDIBLE TONE CONTROLLER: An audible tone controller activates the
projector by impulsing a tone. This coded tone signals the projector to do
what the operator pre-programs into the device.
PUNCH TAPE: Punch tape uses programming logic or electronic circuitry
to pierce a paper tape with a code. The code punched onto this tape cues the
projector for multiple functions.
ELECTRONIC MICROPROCESSORS: Electronic microprocessors digitize
information. This bit information triggers the programmers multiple
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