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Basically Cobb Tester consists of a support frame and a metallic cylinder about 5 cm high with an internal cross section of 100.00 cm2 (11.29 cm internal diameter).
Clamping System :
The cylinder is clamped by spring loaded upper plate lined with rubber mat automatically get clamped as soon as you release the handle. The base board is covered with a rubber mat. The test piece on top by the mat so that a leak proof scale is formed when cylinder is clamped.
The lower edge of the cylinder is machine smoothed. The inner surface of the cylinder is provided with a shallow groove which is parallel to the cylinder axis and bends over the rim of the cylinder. The groove helps in draining off the water after test.
A further development of the well known Cobb Sizing Tester. The liquid container, filled the specified amount of liquid, can be turned up-side down by means of a knob and after the necessary time has elapsed, turned back again, can be used several times before liquid has to be renewed. The lid is provided with spring loaded finger.
A stainless steel roll of 20 cm face and weighing 10.0 + 0.5 kg as been provided to apply for blotting the water.