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Manual fire alarm activation requires human intervention, as distinct from automatic fire alarm activation such as that provided through the use of heat detectors and smoke detectors. It is, however, possible for call points/pull stations to be used in conjunction with automatic detection as part of the overall fire detection and alarm system .
One type of these are the Vitiation Sensing Devices, [4] that detect an adequate supply of oxygen for efficient combustion, thus avoiding the production of poisonous carbon monoxide. As well as detecting a blocked supply of oxygen, these must also detect a blocked exhaust or reversed flow in the exhaust flue owing to wind conditions.
Custards require a slow oven for example, bread a moderate oven, and pastries a very hot oven. Cooks estimated the temperature of an oven by counting the number of minutes it took to turn a piece of white paper golden brown, or counting the number of seconds one could hold one's hand in the oven. [ 3 ]