Fig. 2. Showing comparative wearing of needles used on shellac and Victrolac records.

Published at 988 × 1000 in Things I learned on Phono EQ curves, Pt. 4
Fig. 2. Showing comparative wearing of needles used on shellac and Victrolac records.

source Journal of the Society of Motion Picture Engineers April 1932 p455
シェラック盤を再生した時と Victrolac 盤を再生した時の針の摩耗具合の比較

Fig 2 Showing comparative wearing of needles used on shellac and Victrolac records

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