The audio-visual handbook (1942)

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Types of Visual Aids and Their Uses 37 The first requirement is a piece of fiberboard approximately 24x30 inches in size, or of any other desired dimensions. It is better to use something through which holes may be punched readily, as this will »K!vlW .x;w wMK " w M.wKiW K '*! Vfcrftf 11 ^ ■IB m « » m m m m Front of an Electric Map facilitate the construction of the map. be needed: In addition, the following will 40 to 60 stove bolts, % incn in length. One spool of No. 25 insulated copper wire. One "C" radio battery, 4>V2 volts. One automobile head lamp, 6 volts. The specimens to be mounted on the map. This complete set of equipment will cost about $1.50, and may be used over and over as needed. The smaller items may be secured at any radio or electrical shop and the plasterboard from a lumber yard. The map which is shown in the accompanying illustrations was arranged to accommodate twenty specimens. Spaces approximately five inches square were marked off and bolts were put through the lower righthand corner of each square. The bolt was inserted from the back with the nut on the front of the map.