Viscometer – Searle’s Pattern is a laboratory instrument used for determining the coefficient of viscosity of highly viscous liquids such as castor oil, engine oil, glycerine, honey, and transformer oil. It is designed to demonstrate the working principle of Searle’s viscometer and helps students study viscous resistance in fluids.The apparatus consists of an outer cylinder that can be clamped at any desired height, while the inner cylinder revolves smoothly on pivots. The inner cylinder is graduated in millimeters, allowing accurate observation during the experiment. The slot is covered with a transparent cover for clear visibility and safe operation.

Supplied complete with scale pans and releasing pins, this viscometer is suitable for schools, colleges, universities, and physics laboratories for experiments related to fluid viscosity.

Experimental Objectives

To determine the coefficient of viscosity of a highly viscous liquid using Searle’s viscometer.
To study the viscous behavior of liquids such as glycerine, castor oil, engine oil, honey, and transformer oil.
To understand the relationship between viscous force, motion, and liquid resistance.
To demonstrate the working principle of rotational viscometry.
To compare viscosity values of different viscous liquids.