The Variation of the Compass in Southern California 



and the Difference of Time Between the Tides 



at San Pedro and San Diego 



By B. K. Baumgardt. 



The Astronomical Section has frequently been asked to 

 supply a table of the local variations of the compass. In reply 

 the following information is indicated : 



Los Angeles 146 Easl 



Santa Barbara 14.7 East 



Barstow 14."i East 



San Diego 13.6 Easl 



Yuma 13.5 East 



As these variations of the compass are all toward the East, 

 they must be applied to the right of the magnetic bearing. 



' The variations of the compass are not constant in any part 

 of the world. Locally, the secular change is exceedingly small 

 and may be neglected. 



Tides 



The interval between the moon's transit and succeeding 

 high water Tor our two Southern California harbors is as 

 follows : 



San Diego (mean interval i 9h. 38m. 



San Pedro (mean interval) 9h. 39m. 



The difference in the lagging of the tides between the 

 two harbors is. as will be seen, exactly one minute. 



The difference between the maximum and minimum inter- 

 val is. for the two respective harbors, 



San Diego lh- 35m. 



San Pedro lh- 48m. 



a difference of 13 minutes. 



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