Additive colors are interesting to young students. In this paper, we show a convenient and straightforward method to demonstrate this phenomenon by projector. It produces defocus blur and reduces imaging quality for color mixing. We believe this demonstration experiment can be performed in most classrooms.

Many years ago I was running the standard laboratory experiment on thin lens optics. The source was the usual self illuminated object mounted on an optical bench, and a converging lens formed a real image on a screen. One of the students sitting near one wall of the darkened lab was having some trouble with the idea of image formation. Her face…

Various wave optics experiments can be carried out using an ordinary compact disc. The CD is suitable for use as a diffraction grating. For instance, a standard CD (700 MB) has 625 lines/mm. In this article, the authors describe two white-light diffraction demonstrations for a large audience, realizable using a CD (as reflection or transmission…

SMART Board is a technology that combines the functionality of a whiteboard, computer, and projector into a single system. The interactive nature of the SMART Board offers many practical uses for providing an introduction to or review of material, while the large work area invites collaboration through social interaction and communication. As a…

Perspective is a rich area for mathematical work, and one that should be accessible to many students, since it is based on the everyday experience of viewing the 3D world directly and through familiar 2D representations (drawings, photographs, images on a television or cinema screen, etc). A nice feature of perspective tasks is that they can be…

This textbook aims to point out physical science teachers and others interested in experimentation the usefulness of the Magic Lantern, and especially of the Porte Lumiere, and a few other pieces of apparatus which can mostly be extemporized for physics instruction as well as art and other science instruction. Experiments are included. No attempt…

Describes a screen projector based on liquid crystal display (LCD) that duplicates the monitor of a microcomputer and may be used in group training sessions for demonstration purposes. Suggestions of what features to look for and a buyer's guide are provided. (CLB)

Discusses the rationale and advantages of utilizing double slide projection as a visual presentation technique for lectures and seminars. Provides 12 tips for proper implementation of this technique in conjunction with 10 possible uses and 3 methods of controlling the slide changes. (JJK)

Because class size often limits student opportunity to handle individual models, teachers use stereoscopic projections to demonstrate structural features. Describes three-dimensional pointers for use with different projection systems so teachers can indicate a particular atom or bond to entire classes, avoiding the perspective problems inherent in…

Advantages and disadvantages of using multi-image or lap-dissolve (LD) slide techniques in large lecture sections are discussed. Production, use, and evaluation of LD programs are also discussed. Indicates that these programs are an effective way of improving instruction on visually oriented topics. (JN)

The construction and uses of a device to facilitate the use of an overhead projector to show chemical reactions is presented. Materials and instructions for construction as well as reactor vessels are discussed. (CW)

Describes construction and use of a simple home-built device, using an overhead projector, for use in demonstrations of the addition of various combinations of red, green, and blue light. Useful in connection with discussions of color, color vision, or color television. (JRH)

The use of liquid crystal display (LCD) techniques for projection of computer monitor images onto a large screen for classroom viewing is discussed and illustrated with a pharmacology class presentation on drug/neurotransmitter-receptor interactions. The method is seen as a way of bringing a new dynamic to visual instruction. (MSE)

Provides suggestions for using live demonstrations of online searching to promote dynamic interaction in online instruction. Equipment for live demonstrations is described, including a microcomputer, modem, communications software, and computer projection system; search demonstration techniques are discussed; audience dynamics are considered; and…

This manual discusses the latest (and some not so recent) educational technologies used in classrooms, provides instructions for using them, and offers suggestions as to how they might be used more effectively. The following technologies are included: printed word, black and white chalkboards, overhead projectors, telephone instruction, facsimile…