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Figures (4)

Fig. 1
Fig. 1

Diagrammatic sketch of shadowgraph and connections.

Fig. 2
Fig. 2

Shadowgraph mounted in vertical position for photographing opening characteristics of relay operated by falling weight.

Fig. 3
Fig. 3

Opening characteristics of falling weight operated relay for various heights of fall, as photographed on single film. (Long period vibrations at top of each record are caused by quivering of the pointolite ball image.)

Fig. 4
Fig. 4

Shadowgrams of poorly adjusted commercial relays showing various kinds of “chatter.”