Smithsonian Contributions to Knowledge

annual variation April May June aurora b c m Baffin Bay Bellot Straits bi-hourly bifilar bm z 66 BOARD THE YACHT Calm 1 N. E. Calm Calm Calm copper curves Dawn at 7h deflection diagram difference Dip reduced Dip when loaded disturbances diurnal variation Div's dovekies dusk at 4h epoch Fahr fathoms February March April feet Girard College horizontal force Hour angle hourly January February March July August Latitude lunar lunar effect Lunitidal interval magnetic declination maxima and minima maximum Mean Lat Midn't midnight minimum month monthly mean moon Moon's N. W. by N Needle Noon Philadelphia Port Kennedy readings Referred mean Relative total intensity Rensselaer Harbor scale divisions seen summer Temp temperature Toronto values W. N. W. Calm weight wind winter YACHT FOX ос