Glass tube 90 mm long closed at one end.
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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.
A working model of a clear glass to show and explain the principle involved. It has a cylinder of 25 mm dia and overall lengths of 350 mm, cylinder is provided with non-return float valves and outlet is by means of a side tube.
Dial 100 mm diameter, dial scale 960 to 1060 mb (28-31 in x 0.10 in) figured in black, good quality movement mounted in a polished plastic frame 155 mm diameter with glass in anodised bezel with lug for rear mounting.
Circular gauge reads 0 to 50 lb./in x 1 & o to 3.5 Kg/cm x 0.1 actual (total) pressure with clear perspex back so that the working parts may be seen.
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