Wind chill meter and method of measuring wind chill effect
OwnerJohn Stephen Baerinventor
Life of this patent
Estimating the term…
Abstract
A first thermometer is conventionally calibrated and a second is calibrated to read a predetermined temperature lower than actual temperature and provided with a heater resistor in good heat transfer relation to its bulb. Switch means connects a battery to the resistor to heat the second thermometer until it is observed to read the same as the first. Then the switch is repositioned such that appropriate circuitry causes reduced heating such that the elevated temperature condition of the second thermometer is merely "held" at that position and the bulb of the second thermometer is exposed to the wind and after a predetermined time (on the order of 30 seconds) the second thermometer is read, its reading representing the effective temperature as the result of wind chill.
Claims14
A wind chill meter comprising in combination
- first and second temperature measuring means, the first being conventionally calibrated and the second being calibrated in the same temperature scale as the first but with that scale offset so that the normal reading is low by an amount representative of a preselected chill effect,
- heater means associated with the second temperature measuring means, having appropriate energizing means,
- means for selectively energizing said heater means so that at one selection position, upon energizing the heater means, the indication of the second temperature measuring means can be made to rise to the level calibrated to correspond to the temperature shown on the first temperature measuring means and in a second selection position that level can be maintained in the absence of wind, and
- wind shield means for selectively shielding at least heater means associated with the second temperature measuring means or permitting the wind to cool said heater means associated with said second temperature measuring means.
A wind chill meter comprising in combination
- temperature measuring means with a conventional scale offset below normal by an amount representative of a preselected chill effect,
- heater means associated with the temperature measuring means,
- means for selectively energizing the heater means so that at one selection upon energizing the heater means the indication of the temperature measuring means can be made to rise to the level calibrated to correspond to the temperature observed on a separate conventionally calibrated temperature measuring means, and in a second selection position that level can be maintained in the absence of wind, and
- wind shield means for selectively shielding at least the heater means associated with the temperature measuring means or permitting the wind to cool said heater means associated with temperature measuring means.
The method of measuring wind chill using a pair of temperature measuring means, the first being conventionally calibrated and the second being calibrated to temperature lower than the first by the amount required by the maximum amount of cooling encountered,
- heating the second temperature measuring means rapidly to a temperature where its calibration corresponds to the ambient shown in the first, at which point temperature rise is terminated,
- continuing heating of the second temperature measuring means at a lower rate sufficiently that its temperature measurement will be maintained at the selected reading corresponding to ambient in the absence of wind,
- exposing the second temperature measuring means to wind while maintaining reduced heating in order to reduce the net heating effect to the second temperature measuring means, and
- observing the wind chill effect temperature directly from the calibrations on the second temperature measuring means after its temperature has fallen due to the wind.
Dependencies are inferred from the claim text.