Slide Projector Used In Education
Third, the module suggests the fundamental basis of optics and some of its limitations by including a limited discussion of wave theory. For instance, the theoretical meaning of 'rays' in terms of the motion of wave fronts is introduced, and this meaning is related to the formation and manipulation of practical rays in the laboratory. The basic 'diffraction limit' which determines the minimum spreading of practical rays is mentioned and the student can see this operating by a simple experiment with the slide projector. Unlike most of the modules in the Physics of Technology series, the Slide Projector is divided into only two sections. This means that the work is meant to be completed in two weeks instead of the usual three.
There are two reasons for this difference. First, many instructors will not wish to devote more than two weeks to what is sometimes regarded as a minor, albeit important and interesting, aspect of introductory physics. Second, the shorter form of the module means that instructors who do wish to pursue optics further can do so along two alternative paths. One path is to examine more deeply the technical aspects of geometrical optics itself, such as applications to 'thick' lenses and complicated lens systems. This can be accomplished by following the Projector with, for example, the Binoculars module.
A second possible route is to follow the Projector with a module such as the Spectrophotometer. Which uses optics as a tool to study the spectral properties of light. This in turn leads to numerous applications in the area of materials science. As is well known, spectrophotometers find wide use in medicine, industry, etc., so that their study affords an especially effective approach to elements of applied modern physics. One additional feature of the Projector module deserves mention.
Slide Projector Used In Education System
This concerns the lack of any special equipment required for its use, other than the projector itself. In most cases, instructors will already have access to a projector which can be employed without modification, such as the standard 'Carousel' projector depicted in the text. The experiments will not in any way damage the projector, since the only manipulations involved are the usual ones of focusing, removing the lens barrel, examining the bulb, etc. Besides the projector, only minor items are needed, which are either readily available as such or can be easily fabricated by the instructor or students from available materials (black masking tape, razor blades, 2' x 2' microscope slides, etc.). Thus, the experiments in the module can be implemented with minimal trouble and expense. Furthermore, this will avoid some of the contrived appearance of standard introductory optics apparatus.
Up for bid is a VINTAGE BAUSCH & LOMB SLIDE PROJECTOR WILLIAMS, BROWN & EARLE INC SCIENTIFIC INSTRUMENTS. Overall in average condition for its age, black crackle finish, does have some minor paint chips, flaking and scratches. Have not tested, not sure if in working condition. Overall dimensions 20' high 27' long and 8' wide.
Please view pictures and you be the judge of condition. I only ship on Fridays and Saturdays. If shipping is less than quoted I will refund the difference.Thanks for viewing our auction and happy bidding.