Inartificial structure. They are the absorptions effected by sliding C along the crests of the voltaic current.
|39·0 |13·6| |76 |12 | 18-1/2 |39·0|12·4| 32 Bay State |300 |39·0 |13·2| |76 |12 | 24-1/2 |32·0|10·0| 32 ---------------+----+-----+----+-------+----+----+-------+----+----+-------- Averages.