| DCS # | DEMONSTRATION | REFERENCE | ABSTRACT |
|---|
| 3C30.00 | Intensity and Attenuation | | |
| 3C30.20 | dB meters and horn | PIRA 500 | |
| 3C30.20 | dB meters and horn | 3C30.20 | Place dB meters in the class at 2 meter intervals, then blow a loud horn. |
| 3C30.21 | dB meter and horn | PIRA 1000 | |
| 3C30.21 | dB meter and horn | 3C30.21 | An air horn driven by a compressed air tank gives a 120 dB sound at close range. Use a dB meter to measure the intensity at various ranges. |
| 3C30.21 | air horn | Sc-4 | A railroad horn blown from a tank of compressed air has a nearby intensity of 110 dB. |
| 3C30.22 | sound level meter | S-3c | A sound level meter is used to measure the instructor speaking, etc. |
| 3C30.30 | loudness (phones and sones) | PIRA 1000 | |
| 3C30.35 | hearing -3dB | PIRA 1000 | |
| 3C30.35 | hearing -3dB | 3C30.35 | A function generator with a dB meter is used to quickly adjust to half power. |
| 3C30.36 | 3 dB | 19-4.15 | One and two students pound the table equidistant from an observer. |
| 3C30.41 | attenuation of materials | S-88 | place various materials between a sounding board and a tuning fork stuck in a block of wood. |
| 3C30.42 | modified tuning fork resonance box | 19-9.2 | The tuning fork is removed from a resonance box and a rod, string, and water are interposed. |
| 3C30.43 | attenuation in CO2 | S-89 | A high pitched tone transmitted through a 10' pipe will be attenuated when filled with CO2. |
| 3C30.45 | acoustical tiles | S-7f | Show various acoustical tiles. |