WESSEX - ACCELERATED POLISHING MACHINE
Road Surface Testing
    Model: ACCELERATED POLISHING MACHINE 
    Country of Origin: UK
    Use: Tests were devised using an Accelerated Polishing Machine and a friction measuring device, a Skid-Tester (otherwise known as the Pendulum, also manufactured and supplied by Wessex), to determine a Polished Stone Value.
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In 1950 increased traffic flows and higher speeds, together with concerns about road safety led to research into the relationship between road materials and skid-resistance. Research at the UK Road Research Laboratory showed a significant relationship between polishing of aggregates used in road surfaces and skid resistance. 
 
Tests were devised using an Accelerated Polishing Machine and a friction measuring device, a Skid-Tester (otherwise known as the Pendulum, also manufactured and supplied by Wessex), to determine a Polished Stone Value. 
 
These developments have resulted in a simple and inexpensive procedure to determine skid resistance in advance of a road being built. Use of the PSV tests in road construction has had a major influence in the reduction of accidents. 

Width 
81cms 
Depth 
79cms 
Height - Frame 
123cms 
Height - Water Tank 
155cms 
Volume 
0.79cu metres 
Weight 
205kg 
Electrical Supply 
230v/110v. 
50/60 H 
Single Phase 13am 

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