306 BF.J.J. SYSTEM TFCflNIC/IL JOURNAL 



Fig. 12 shows a model of the upper half of the space characteristic 

 of an array of 32 antennae located along the diagonals of a square, 

 with the parameters (^X, OT) in each diagonal. This space character- 

 istic is a complicated surface, the main features of which are shown 

 l)\' (he model, the smaller lobes not being shown clearly in detail. In 



Figj 12 — Model of the space characteristic for an array of 31 antennae located 



along the diagonals of a square, with a separation of one-half wave-length between 



adjacent antennae in each diagonal, and with zero phase difference 



the horizontal plane the maximum amplitude is 1/2, occurring along 

 the diagonals of the square; the amplitude reaches a pronounced 

 maximum of unity, however, in the vertical direction. 



I am greatly indebted to Dr. Louisa E. Tow-nshend for super\-ising 

 the preparation of the drawings and models, and expecially for the 

 accuracy attained in redrawing Fig. 1. 



