Title: Temperature recording instrument

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Abstract: The temperature Recording instrument contains the usual thermal measuring system consisting of a bellows assembly, a temperature sensitive bulb and capillary tubing between the bellows and bulb and a recording system including a marking element which is responsive to the energization of the bellows for permanently indicating the temperature sensed by the bulb on chart paper mounted on a base plate located in the instrument housing. A fulcrum having an axis extends through the base plate and carries a bracket which is provided with one slot or with a pair of slots on opposite sides of the axis. A spool is located in one or the other of the slots. An adjusting screw is carried by the bracket and is threadedly connected to the spool. Rotation of the adjusting screw is effective to move the spool in the corresponding slot relative to the fulcrum's axis. The marking element is located on the chart side of the base plate and is secured to the bracket. The bellows includes a movable element engageable with the spool. Energization of the bellows is effective to move the movable element which engages the spool and rotate the bracket about the fulcrum resulting in the movement of the marking element in one direction across the chart. If a second slot is provided in the bracket, the spool may be located therein, with the movable element of the bellows engaging same to effect rotation of the bracket and the movement of the marking element in the opposite direction across the chart.


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