The Overhead Projector (Ohp)
The Overhead Projector (OHP)
August 24, 2012
Introduction
Overhead Projectors are still being used in a lot of schools, like in the Philippines. It is not as modern as other equipments, but it still serves its purpose which is to show enlarged images on screen.
I. Description
The Overhead Projector is an optical device for showing images on screen, usually for group viewing. The OHP is mainly used for projecting charts, sketches, and other material prepared on sheets of transparent plastic.
II. Techniques
• You can show pictures and diagrams, using a pointer on the transparency to direct attention to a detail. The silhouette of your pointer will show in motion on the screen.
• You can use a felt paper or wax-based pencil to add details or to make points on the transparency during projection.
• You can control the rate of presenting information by covering a transparency with a sheet of paper or cardboard (opaque material) and then exposing data as you are ready to discuss each point. This is known as the Progressive Disclosure Technique.
• You can superimpose additional transparency sheets as overlays on a base transparency so as to separate processes and complex ideas into elements and present them in step-by-step order.
• You can show three-dimensional objects from the stage of the projector-in silhouette if the object is opaque or in color if an object is made of transparent color plastic.
• You can move overlays back and forth across the base in order to rearrange elements of diagrams or problems.
• For special purpose, you can simulate motion on parts of a transparency by using the effects of polarized light.
• You can simultaneously project on an adjacent screen other visual materials, usually slides or motion pictures, which illustrate or apply the generalization shown on a transparency.
August 24, 2012
Introduction
Overhead Projectors are still being used in a lot of schools, like in the Philippines. It is not as modern as other equipments, but it still serves its purpose which is to show enlarged images on screen.
I. Description
The Overhead Projector is an optical device for showing images on screen, usually for group viewing. The OHP is mainly used for projecting charts, sketches, and other material prepared on sheets of transparent plastic.
II. Techniques
• You can show pictures and diagrams, using a pointer on the transparency to direct attention to a detail. The silhouette of your pointer will show in motion on the screen.
• You can use a felt paper or wax-based pencil to add details or to make points on the transparency during projection.
• You can control the rate of presenting information by covering a transparency with a sheet of paper or cardboard (opaque material) and then exposing data as you are ready to discuss each point. This is known as the Progressive Disclosure Technique.
• You can superimpose additional transparency sheets as overlays on a base transparency so as to separate processes and complex ideas into elements and present them in step-by-step order.
• You can show three-dimensional objects from the stage of the projector-in silhouette if the object is opaque or in color if an object is made of transparent color plastic.
• You can move overlays back and forth across the base in order to rearrange elements of diagrams or problems.
• For special purpose, you can simulate motion on parts of a transparency by using the effects of polarized light.
• You can simultaneously project on an adjacent screen other visual materials, usually slides or motion pictures, which illustrate or apply the generalization shown on a transparency.