the Hydrogen Molecule. 



1031 



The chart, fig. 2, is obtained by equating to zero the 

 functions of Z and r within the braces of these equations. 

 The caption under the figure is sufficient to render further 

 description unnecessary. There is a point on the rotation 

 axis (z) at a distance 1*18 x 10~ 8 cm. corresponding to the 

 result at the conclusion of the second paper showing stable 



Fig. 2. 



■Z*=t0 3ZTM5J55 .532 



~% 



The scale is indicated by the central circle with a diameter of 10— 8 cm. 

 The first H-atom is supposed to have its centre at the centre of 

 this circle, and the second H-atom may be located anywhere with 

 its axis parallel to the first, the z-axis. There are two sets of curves, 

 the one where the .r-component of the total force between the 

 atoms is zero, and the other where the z-component is zero. These 

 are indicated respectively by the horizontal and vertical hatching, 

 which terminates on these two sets of curves. In the region of 

 the horizontal hatching the .r-force on the second atom due to the 

 first is in a direction away from the axis of z, and in all other regions 

 towards this axis. Similarly, in the region of the vertical hatching 

 the z-force is directed away from the axis of x. 



The chart is plotted from equations (29), (30), the gravitational 

 term being balanced by the electrostatic r~ 10 term, the coefficients 

 of the ? ,_6 and ?* -8 terms being zero. There is no position of 

 stable equilibrium here, since the x- and s-curves nowhere inter- 

 sect. The angles where the tangents to the a>curves fall (the 

 dotted lines) are given by the values of Z 2 in the margin. The 

 tangents to the 2- curves are shown by the dash-lines. 



