| In Denmark in 1923, an oscillograph light modulator and selenium-cell reproducer were developed. |
| The cathode-ray oscillograph makes use of a sharply focused electron beam to display the relationship between variable quantities on a luminescent screen similar to that used in a television. |
| When a current is to be measured by the oscillograph, it is passed through the turn of wire in the magnetic field. |
| Fig. 14 is a photograph of nine different vowel sounds which have caused the oscillograph to take their pictures. |
| The signals that the probe receives can be displayed on a small screen with an oscillograph. |
| These observations were supported by the use of sound level and oscillograph records. |
