For precisely estimating and recordingroom temperature by methods for pen on printed graph. Outline might be held asrecord. Comprises of bimetallic loop of non-rusting material uncovered toatmosphere at end of a ventilated metal case, andconnected to recording pen. As temperature rises and falls,coli loosens up or winds, making arm move vertically acrosschart which Is appended to metal drum with which is fitted aseven days winding clock. It finishes one revolutiontwenty four hours. Diagrams are separated on a level plane into hourssub divisions of fifteen minutes and vertically Into degreesconverting scope of 10. to 50.C. Best of case is pivoted at oneend and is secured at inverse end by metal hasp. Case isfinished in satisfying shading and has clear glass window forobservlnd temperature diagram. Outfitted with 50 charts,bottle of exceptional chronicle ink and bearings for utilize.

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