Marsh Cone .
This cone is used to find out viscosity of bentonite slurry and similar
material. The marsh cone is 6 inch in diameter at the top and 12 inch
long, and tapers to join a tube 2 inch long and 3/16 inch inside dia.
The capacity of the funnel is 1500cc. Time in seconds required to
flow out 1000cc of slurry from cone is measured as funnel viscosity
of the material.