CARD CATALOG

make smaller images. Figure 2-14 shows the distances three different projectors should be placed from a 70-inch screen in order for the image to fill the screen. Figure 2-15 provides additional information concerning lens length, projector distance from the screen, and screen size for several types of projectors. · Patch cords. Sounds are transferred from one sound source to a recorder by means of a patch cord. This method does not pick up foreign noise as it would if a microphone were used. In a patch cord, the wire is shielded so that it has at least one conductor surrounded with insulation in the form of a braided wire shield. Duties and Responsibilities One of your responsibilities for your RMF’s media center will be to publicize that audiovisuals are available for use by authorized persons. An up-to-date RMF’s media center should have a variety of audiovisual materials and equipment in addition to the printed media. CARD CATALOG.—Some of your duties may involve the maintenance and use of the card catalog. The card catalog, as shown in the following sample, will tell you if a specific item is available. It will also provide a number to tell you where to find it. Having a card catalog for your RMF’s audiovisual equipment and materials will help you maintain an inventory of the media center. In most media centers, green cards are used for audiovisuals to distinguish them from the white title cards typically used for printed media. Notice the following sample: Notice the number E-7-B in our sample. The notation E-7-B stands for a piece of equipment (E) that is maintained in area 7 and located in cabinet B. This number should also be placed on the equipment item itself. In your card catalog, all audiovisual devices and types of media should be labeled in this manner. The letter designations used for the various media are as follows: FS — Filmstrip RFS — Record R — Recording Figure 2-14.—Distances from a projection screen. 2-23