GENERAL PHYSICS 
[Simpson and Wright] 
By Charles S. Wright, B.A. 
The field covered in pure Physics by the Expedition was 
by no means a small one. It may conveniently be divided 
as follows : 
(a) Magnetic observations. 
These consisted in continuous photographic records by 
Eschenhagen magnetographs of the elements N.S. 
(astronomical) force, E.W. force, and vertical force. 
These instruments were placed in a cave dug into 
an ice-drift a couple of hundred feet to the south-west 
of the hut at Cape Evans. This furnished the highly 
desirable advantage of a constant temperature condition, 
important in that the sensitiveness of the instruments 
is dependent upon temperature. The light in the cave was 
furnished by a small electric lamp run from accumulators 
in the hut. Time signals were recorded on the trace every 
two minutes by means of a clock fitted with electric 
contacts, kept also in the hut and compared daily with 
the standard chronometer. 
The programme of magnetic work included ' quick 
