544 HENRY A. HUNT. 
is shown in full force in front of the anticyclone, which by the 
way has lost none of its energy since the previous day; the 
depression is well off the coast and on its way to New Zealand. 
This burster reached a velocity of forty-nine miles per hour, and 
lasted thirty-five hours. 
TYPE XV.—THE BLACK NORTH-EASTER. 
This is a somewhat uncommon but nevertheless well known 
type of weather on the coast about Sydney. Its characteristics 
are a very strong and persistent north-east gale, continuing day a 
and night for two or more days; it has been known to last five 
days and nights, and it ends with the advent of a southerly 
burster. Its cause is found in an extensive col, the rear of one 
anticyclone being at rest over this coast, while another lies over the 
Australian Bight. Ifthe grade is rather steep and the system 
at rest for several days, then the north-east wind persists with 
force proportionated to the grade, until the whole system mové 
forward ; the southerly winds in the front of the approaching high 
pressure then displace the north-easter and the storm is over. 
There have been no good examples of this type since weather 
charts have been printed here. Chart 33 shows the necessaly 
forms of isobars, but the grade is not steep enough for a gale. 
