INTRODUCTION: Rotary Extensometer
In same areas conventional method of Roof Testing is not possible or convenient. There is no visual indication of how close is the system to ultimate failure.
With conventional free standing support such as props, there is obvious indication when they are carrying excessive load, the greater the load the greater the deformation.
‘NMC’ Head Gear Pulley are supplied conforming
as per IS 9239:1999
Materials used are of following specification
1) CASTING : Conforms to Grade 25 of IS 210
2) AXLE : Axle is of Class 5 of IS 1875.
3) SPOKES : Conforms to IS 8500.
Smoke Generator consists of Glass tube containing granulated pumic stone saturated with anhydrous tin or titanium tatrachioride. Glass tube is fitted with a rubber aspirator bulb thro’ rubber tube at one end & the other end is in the form of a tip coyèred by a rubber cap.
