[pawson] METHODS OF INVESTIGATION OF TIDES & CURRENTS 11 
Sable. A second station, established at Yarmouth to command the 
outer part of the bay, was therefore dispensed with; as the difference 
between the two, in the time of the tide, was found to be quite constant 
throughout the year as well as during the course of the month. This 
difference is used to compute the Yarmouth tide tables. The limit 
between the Bay of Fundy and the Atlantic coast of Nova Scotia, 
which is referred to Halifax, is sharply defined; as immediately inside 
of Cape Sable the tide shows distinctly a Bay of Fundy type. The 
turn of the tidal streams throughout this region is also referred very 
satisfactorily to St. John. 
The Bore.—The opportunity was taken in 1898 to make an exam- 
ination of the bore on the Petitcodiac river at Moncton. The rate of 
rise of the water after the bore passed was reduced to the form of a 
profile of the water surface, which served to throw light on the nature 
of this tidal feature. A description and diagrams given in one of the 
reports of progress is republished in “Nature” (14). 
Summary.—With the discontinuance of the stations above re- 
ferred to, after a sufficient time to serve their purpose, and the estab- 
lishment of an additional station at Charlottetown because of the 
complexity of the tide in Northumberland strait, there come to be 
six principal stations in Eastern Canada, for which tide tables are 
calculated directly by harmonic analysis. The regions commanded 
by these stations have now been sufficiently well defined to make it 
certain that all the harbours of Eastern Canada can be referred to 
them by tidal differences; and the stations serve also for reference in 
the investigation of the currents. The extent of the various regions 
is described briefly in the tide tables, in which the tidal differences 
throughout each region are given. 
Pacific Coast.—On this coast, tidal information was in a very un- 
satisfactory position. The harbours of British Columbia were referred 
to ports of reference in the United States, situated in Puget sound or 
on the open coast. These were necessarily unsuitable owing to the 
difference in the character or type of the tide. A tidal station was 
established by the Public Works department as early as 1895 in the 
middle of the Strait of Georgia. It was situated at Sand Heads, off 
the mouth of the Fraser river. The record obtained, although much 
broken, was brought into shape for harmonic analysis. This station 
proved eminently suitable as a port of reference for the harbours 
throughout the Strait of Georgia; and by 1901 tide tables for it were 
published by this Survey. This proved a great boon, as the tide of 
that Strait presents special features which make it impossible to de- 
duct its time from ports of reference in other regions. A summary 
of the early results, up to 1902, is given in one of the reports of progress. 
