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V. NEW TOOLS AND OLD
Projectors and projections
Other standard technologies used in teaching include the
projection of slides and audio-visual material. For many
years systems for the projection of 35 mm photographs in
black and white or color fulfilled a significant roles in
classrooms and lecture halls. This technology enables the
presentation of collections of many images ordered
sequentially which can be remotely controlled either
manually or using pre-programmed automated circuits. Many
educational establishments have huge collections of slides,
placed in straight or circular holders that are not always
easy to manipulate, load and unload.
This system was improved a few years back with the
incorporation of audio-visual technology that worked wonders
with the integration of sound and image. However, today a
new generation of audio-visual resources has appeared,
multimedia based on the technology of digital projectors and
CD-ROM's which have opened up a new field with an impact on
education that could be incalculable. CD-ROM's can hold
thousands of photographs and images in movement, as well as
sounds. Their cost is minimal when compared to the
information contained on previous audiovisual systems.
Digitized images do not rub out or deteriorate. In addition
they are easy to handle, as access to each image is
immediate and can be controlled from a computer program.
Presentations are more flexible, in particular when the
teacher has generated his or her own CD-ROM. Information can
be stored on a computer hard disk, (which currently have an
even greater capacity than a CD-ROM) so that the necessary
changes can be made. The greatest advantage is that optic
disks are highly resistant and easily transportable.
Students can navigate the CD after class, either
individually or as a group, going over the contents and
learning them. In the near future these inquiries will be
made directly via the network.

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