TCBA Volume 17 - Issue 1 Page 16 of 18 Experimental High-Frequency Apparatus (concluding installment) Fig 30 Side elerotion of Rotary Gap Fig 31 Plan of Rotary Gap Fig. 32 Laying off disk Fig 33 Fig 34 Fig 35 Scale of inches for Figs. 30, 31 and 32 Detail drawing twise this scale. Stanley Curtis