3C- Acoustics

3C10.10          Model of Ear                            Q-1L               Maryland

3C20.10          Range of Hearing                      Q-1R               NCSU  Maryland

3C20.30          Siren Disc                                 Q-1C

3C30.22          Sound Level Meter                   Q-1C               Maryland

3C55.70          Microphone and Scope            10-5R              Maryland

3C55.72          Fork and Box on Scope           Q-3C