Abstract: A thermometer device for application to an exterior of a structure, such as a vehicle, having one face viewed from the interior of the structure, including a thermometer element and a readout portion, a housing for nesting the thermometer element in a sheltered manner and having air inlet and outlet openings to allow ambient air to enter and pass over the thermometer element and at the same time protects the element from the suns rays.

Abstract: A thermometer for use in a vehicle to indicate the outside temperature to the driver. A rotary drum temperature indicator is located within the driver's compartment of the vehicle while a bimetallic sensing unit is located outside the compartment. The sensing unit is mechanically coupled to the drum indicator and extends therefrom into the housing of a rear view mirror. The housing contains openings which admit the outside air. When the vehicle is in motion a stream of air flows through these openings and is directed to flow over the sensing unit so that the temperature of the latter conforms to the temperature of the outside air. As the temperature changes, the sensing unit causes a proportionate rotation of the rotary drum relative to a reference line so that the position of a temperature scale imprinted upon the drum may be read relative to the reference line for determining the outside temperature.