APPENDIX D CLI 



method adopted has been to establish principal tidal stations, equipped 

 with registering tide gauges, to obtain a continuous tidal record day and 

 night throughout the year, for harmonic analysis. By this analysis the 

 tidal constants are obtained from which tide tables are calculated. The 

 region that can be referred to each of these stations has now been suffi- 

 ciently defined to determine its limits. 



The region that could be referred to Quebec with advantage, was 

 foimd to extend only from the Traverse to the head of tide water at 

 Lake St. Peter. For the open estuary below the Traverse, it was neces- 

 sary to make Father Point the port of reference, and it was accordingly 

 raised to the rank of a principal station. On the other hand, the station 

 placed on Anticosti at South-west point, to command the mouth of the 

 St. Lawrence, it was found possible to dispense with; as the whole of 

 that region as far as Gaspé, and even including Chaleur bay, could be 

 referred to Father Point. The tide for the harbours throughout the 

 Gulf of St. Lawrence can be deduced directly or indirectly from St. Paul 

 island, which commands its main entrance from the Atlantic. For 

 Northumberland strait, a system of variable differences is employed in 

 the calculations, to avoid the maintenance of an additional principal 

 station. It has been found advisable, however, to obtain data specially 

 for Charlotteto-wTi, as a basis for independent tide tables; although it 

 does not promise to prove suitable as a port of reference for any part of 

 Northumberland strait. 



For Belle Isle strait, a principal station is established at Forteau 

 bay. The tide there is of little importance in itself, owing to its small 

 range ; but it was hoped that the turn of the current in the strait could 

 be deduced from it. After careful investigation however, it has been, 

 ascertained that the tidal element in the current is often overcome for 

 days at a time by a dominant flow in one direction or the other through 

 the strait. Under these conditions, the calculation of the tidal element 

 alone, would not be of practical value. ( See " Currents in Belle Isle 

 strait," from investigations by the Tidal and Current Survey, 1907.) 



In the Bay of Fundy, St. John, N.B., is centrally situated and well 

 suited as a port of reference. The tidal differences throughout the bay 

 are remarkably constant. The station at Halifax has been discontinued, 

 as tidal record for thirteen years, in all, has been obtained there, which 

 is considerably longer than for any port in the United States. 



There will thus be in all seven principal tidal stations in Eastern 

 Canada, and for six of these tide tables require to be calculated ; namely, 

 for Quebec, Father Point, St. Paul island, Halifax, St. John, N.B., and 

 Charlottetownn. It will undoubtedly be possible to refer all the harbours 

 of Eastern Canada to these stations as ports of reference. The need for 



