Might therefore be fitted inside the helmet between the rings of waves whose periods of recurrence are similar to.
200|25 |3·75|23·5|10 |24 |1 |43 | 10 |27·5|·50 | North America| 200|30 |5 |21 |13 |30 |2 |44·5| 8 |24 |·50 | Massachusetts| 200|29·5|8·5 |22 |10 |28 |2 |44 | 10 | -- | Narraganset | 210|26 |5 |25 |11 |30 |1 |60 | 11 |24 | -- | -- | +----+----+----+----+----+---+--+----+----+----+-----+ Averages | 200|26 |5·6 |24·8|11 |30 |--|50·8| 10 |24·8| -- | Providence | 180|27 |5·5 |22 |15 |34 |2 |44 | 8 |26 | -- |23 | 9 |30 |1 |60 | 11 |21 | -- | Albany | 212|26 | -- | -- |-- |1 |65 | 10 |27·5|·50 | North America| 200|30 |5 |21 |13 |30 |2 |44·5| 8 |24 |·50 | Massachusetts| 200|29·5|8·5 |22 |10 |28 |2 |44 | 10 | .