A glass tube of 6mm bore is cased in an enamelled and lacquered brass case ,standing on a finished wooden board with plates fitted on wall. Open plate reflectors, nuts and bolts for vertical adjustments. A dual scale graduated in 25 to 32 inches and 640 to 810mm is read by verniers moving by rack and pinion, reading to 0.002 inch and 0.1mm are encased in a glass cylinder. A glass cistern at the lower end of barometer is provided with an ivory point to fix the level of mercury. A thermometer -10 to 50°C is placed on the wooden board.
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