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Tony I have sent you diagrams from Practical Coal Mining by WS Boulton 1910 vol 2. So no-one else needs to scan them for you! Cheers Roger ----- Original Message ----- From: "Tony Brooks" <[log in to unmask]> To: <[log in to unmask]> Sent: Tuesday, December 14, 2010 3:32 PM Subject: [mining-history] Detaching hook Hi All I am after a good diagram showing how a detaching hook works. I know them as 'Humble' hooks but they are also referred to as King's patent safety detaching hook for mine cages. I am putting together an interpretation panel on mine winding and I need an illustration. Tony Brooks