293 



Observations on the diurnal Variation of the Magnetic Needle, at the 

 Whale Fish Islands, Davis's Strait. By Lieutenant Henry Foster, 

 R.N. F.R.S. Read April 13, 1826. [Phil. Trans. 1826, Part IV. 

 P- 71.] 



Magnetical Observations at Port Bowen, be. A.D. 1824-25, compre- 

 hending Observations on the diurnal Variation and diurnal Intensity 

 of the Horizontal Needle ; also on the Dip of the Magnetic Needle 

 at Woolwich, and at different Stations, within the arctic Circle. By 

 Captain W. E. Parry, R.N. F.R.S. and Lieutenant Henry Foster. 

 R.N. F.R.S. Read April 13, 1826. [Phil. Trans. 1826, Part IV. 

 p. 73.] 



Abstract of the daily Variation of the Magnetic Needle No. 2. By 

 Lieutenant Henry Foster, R.N. F.R.S. Read April 13, 1826. 

 [Phil. Trans. 1826, Part IV. p. 118.] 



Observations for determining the Dip of the Magnetic Needle. By 

 Captain W. E. Parry, R.N. F.R.S. and Lieutenant Henry Foster, 

 R.N. F.R.S. Read April 13, 1826. [Phil. Trans. 1826, Part IV. 

 p. 126.] 



Observations on the diurnal Changes in the Position of the Horizontal 

 Needle, under a reduced directive Power, at Port Bowen, 1825. By 

 Lieutenant Henry Foster, R.N. F.R.S. Communicated January 



12, 1826. Read April 13, 1826. [Phil. Trans. 1826, Part IV. 

 p. 129.] 



A Comparison of the diurnal Changes of Intensity in the Dipping and 

 Horizontal Needles, at Port Bowen. By Lieutenant Henry Foster, 

 R.N. F.R.S. Communicated February 25, 1826. Read April 13, 

 1826. [Phil. Trans. 1826, Part IV. ^.177.] 



Account of the Repetition of Mr. Christie's Experiments on the Mag- 

 ' netic Properties imparted to an Iron Plate by Rotation, at Port 



Bowen, in May and June, 1825. By Lieutenant Henry Foster, R.N. 



F.R.S. ; together with Mr. Christie's Remarks thereon. Read April 



13, 1826. [Phil. Trans. 1826, Part IV. p. 188.] 



In these communications are recorded all the magnetic observa- 

 tions made by Lieutenant Foster, alone or in conjunction with Capr 

 tain Parry and the other officers of the North Western Expedition, in 

 the years 1824 and 1825 ; and they embrace a variety of points of 

 prominent interest in the theory of magnetism. They are digested 

 under separate heads, according as they refer to one or other of the 

 following points : 



1. The variation, and its daily and hourly change. 



2. The dip, and the changes observed in it. 



