Messrs Henry Williams' Patent Diamond Crossing Point Protectors

maker:
Henry Williams Ltd.

Drawing, "Messrs Henry Williams' Patent Diamond Crossing Point Protectors", hows angle point protectors illustrating the principle of working. Protectors coloured in red are raised in position and protectors uncoloured are down. Light red indicates road in use. Fig.117

Details

Category:
Documents
Object Number:
2008-8489
type:
drawing
taxonomy:
  • visual and verbal communication
credit:
British Transport Commission