|Speed of rotation of wheel||75rpm|
|Distance between axis of rotation and axes of bottle||67mm|
|Maximum number of bottle which can be mounted at a time||6|
|Inner diameter of bottles||30mm|
|Speed of rotation of fan||1425rpm|
|Size of blades of fan||75 x 90 mm|
|Motor||¼ HP 230 volt single phase AC|
Water vapour permeability of leather is evaluated by clamping a circular test specimen over the mouth of a bottle containing a solid desiccant and subjecting it to a rapid current of air. The air inside the bottle is circulated in weight if the desiccant in motion. The increase in weight of the bottle over a specified interval of time gives the quantitative measure of the water vapor permeability of the leather sample under test.