tender for purchase of laboratory vane shear apparatus (asper specification) , laboratory vane shear apparatus , conforming to is: 2720 (part 30) (i) torque head assembly  adjustable in height by means of a lead screw  lead screw operated through a drive wheel for lowering the vane into the soil specimen (ii) drive mechanism  electrically operated motor with a rotation speed of 1/60 rpm  suitable for operation on 230 v ac, single phase  equipped with worm gear arrangement for smooth rotation (iii) torque measurement system  upper end connected to a calibrated torsion spring  vane shaft connected through a hollow shaft to a resettable pointer  dial graduated in degrees to indicate angle of twist  torque obtained by multiplying dial reading with spring factor (iv) vane assembly  vane diameter, rod diameter, vane height and size as per is specifications (v) soil container & sampling arrangement  container provided for holding soil specimen  sampling tube of 38 mm diameter, which can also be used as container (vi) spring set supplied with a set of four interchangeable springs: 2 kg/cm², 4 kg/cm² , 6 kg/cm² , 8 kg/cm² (vii) accessories & storage  complete apparatus supplied with all standard accessories  packed in a wooden carrying case