1. A weather forecasting device comprising:
- (a) a device which deforms according to the magnitude of atmospheric pressure,
- (b) a member which transmits the amount of said deformation,
- (c) a bell crank adapted to be rotated by said transmission member,
- (d) a device connected to said bell crank and adapted to indicate values of atmospheric pressure,
- (e) a grooved pulley fixed to the shaft of said bell crank to rotate with rotation of the bell crank,
- (f) a switch plate having both resilience and electric conductivity and attached to the grooved pulley such that normally it is rotated together with the grooved pulley but when it is subjected to a rotation-preventive force exceeding a predetermined limit, slippage takes place between said switch plate and said grooved pulley so that it is no longer rotated with the latter,
- (g) a pair of contacts spaced apart from each other with the front end of the switch plate disposed therebetween,
- (h) a device for representing weather forecasts, and
- (i) electric circuitry designed to set said weather forecast representing device to a predetermined representing mode according to a situation of contact between the switch plate and the two contacts,
- the arrangement being such that if there is a change in atmospheric pressure, the switch plate first comes in contact with either of said contacts and then deforms by bending and if there is a greater change in atmospheric pressure, slippage takes place between the switch plate and the grooved pulley.
2. A weather forecasting device as set forth in claim 1, wherein either of said contacts is movable for adjustment of the distance between the contacts.
3. A weather forecasting device as set forth in claim 1, wherein the switch plate is provided with opposed bulges for resiliently clamping the switch plate on the grooved pulley.
4. A weather forecasting device as set forth in claim 1, wherein an aneroid type barometer consisting of a hollow assembly and a spring is used as the device which deforms under atmospheric pressure.
5. A weather forecasting device as set forth in claim 1, wherein the transmission member and bell crank serve to compensate changes in atmospheric pressure to ensure exact proportionality to said changes.
6. A weather forecasting device as set forth in claim 1, wherein the four lamps are individually lighted to give the representations, in steps, "it will be fine", "atmospheric pressure is rising", "atmospheric pressure is falling" and "it will rain".