MAGNETIC METHODS 



121 



Fig. 48. — A, standard Askania magnetometer for measuring vertical or horizontal _ magnetic 

 intensity; B, simplified Askania vertical magnetometer, a, gauss eyepiece; b, light window; c. 

 mirror; d, instrument case; e, clamp lever; /, tripod head; g, leveling screws; h, auxiliary magnet 

 holder; t, tripod legs. 



Magnet System 



The magnet system consists of two gold-plated, magnetized bars of 

 tungsten or cobalt steel fastened together by a cube-shaped, structural 

 member made of aluminum, t A view of two types of vertical and hori- 

 zontal component magnetic systems is shown in Figure 49. A quartz knife- 

 edge is fastened to the block at right angles to the long axes of the mag- 

 nets. The quartz knife-edge rests on two semi-cyHndrical quartz bearings 

 and supports the moving system. An arresting system is provided to lift 

 the quartz knife-edges from the cylindrical quartz bearings while the 



t Erwin Roux, "Magnetic Balance for the Measurement of Intensities," U. S. Patent 1,976,636, 

 Oct. 9. 1934. 



