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The recorder (Fig. 6) is constructed on the basis of a helix, which raises the lever arm and pen by steps of l/10th mile up to 100 miles, or 1/5 km. up to 200 km., when the pen descends to zero. The helix is moved by a chain of gear wheels and mechanism actuated by the attraction of an armature of an electro-magnet, the impulses, being received from the transmitter.

FIG. 6.

The battery consists of three or four Leclanche cells, fitted into a box.

The electrical recording anemometer consists of transmitter, and recorder, and is complete with battery, pen, ink, and 50 charts.

^Electrical Wind Vane, Lownes Patent.

The apparatus consists of a rotating vane and a dial electrically connected together. Three or four Leclanche cells provide the motive power. The dial, which resembles a clock face, and which may be placed in any desired position, is marked with the eight cardinal points of the compass. It is made in sizes up to 17 in. (43 cm.). The pointer of the dial moves round as the direction of the wind alters. As in the electrical anemometer a necessary part of the design is an arrangement to allow only a momentary electrical current to flow, in whatever position the vane may come to rest.

* This instrument will be recording during the Exhibition.

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