T2

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H is the head, bearing the tentacles T1 and T2, of which the upper pair have the eyes, E.

The two thermometers are indicated as T1 and T2 and are inserted in the ingoing and outgoing water respectively.

Let v1 denote the velocity of T1 at any given instant; v2 that of T2.

The cocks T1 T2 are normally open, allowing the ingress of steam and water respectively to the tube.

The result is a varying voltage applied to the grid by the secondary T2.

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