Tough made of porcelain having capacity of 150 ml.
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Pipette type, comprising glass float calibrated having coloured zones for charged, partly charged and uncharged conditions. Compressible bulb and rubber tube with fittings to glass body.
Four glass tubes of different shapes & cross sectional areas are connected to a common horizontal tube. Mounted on a base to show level of liquid is constant.
Glass tube 90 cm long with bulb on shorter limb.
The whole column of mercury is visible. Scale is graduated in both English & metric systems. Zero point adjustment is carried by a screw clamp attached to glass tube. Complete fitted on a polished wooden board.
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