owland succeeded nal, however, is made to consist of a pair of cut-out half-waves which are not adjacent. It, therefore, hap- in securing wonderfully perfect synchronism. Fig. 3 pens that wave groups can be formed, which are a shows the method which he employed. Fixed to the shaft, S, of a… … Relays. leaving an extra half-wave between each group. If so as to correspond with the groups of half-waves small channel, C, filled with mercury. If the speed of out of each group two or more of its half-waves be cut, shown in Fig. 2. The group A is connected to the con- the rapidly-revolving…
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