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Letter to the Editor
| Note from the Editor | |
| Stefan CZARNECKI | 3-4 |
Research Papers
| Noise sources identification in machines and mechanical devices | |
| Czesław CEMPEL, Urszula KOSIEL | 5-19 |
| The equation of acoustic rays in an inhomogeneous moving medium | |
| Rufin MAKAREWICZ | 21-27 |
| On the possibility of an investigation of semiconductor surface properties using ultrasonic surface waves | |
| Aleksander OPILSKI | 29-32 |
| On an approximate method for calculating filters based on acoustic surface waves | |
| Zenon CEROWSKI, Aleksander OPILSKI, Tadeusz PUSTELNY, Marian URBAŃCZYK | 33-41 |
| Thermal relaxation processes in some organic liquids | |
| Zygmunt KLESZCZEWSKI | 43-50 |
| Ultrasonic holography in ophthalmology — physical considerations* | |
| Robert C. CHIVERS | 51-63 |
| Measurements of ultrasonic velocity in the molten salt mixture CdC12-NaCl | |
| Bronisław ZAPIÓR, Adam JUSZKIEWICZ, Andrzej GRZEGORCZYK | 65-71 |
| Analogue modulator for psychoacoustical pulse measurements | |
| Antoni JAROSZEWSKI, Andrzej RAKOWSKI | 73-79 |
Chronicle
| XXIII Open seminar on acoustics Jaszowiec, 6-11 September 1976 | |
| Editorial Committee | 81-83 |