Hi List
Don't know about "Cows' Horns" down the pit but here in NSW Aust, "Bulls Horns" were (and are) vertical steel stakes used on rail trolleys to restrain loads (eg timber).
Also have heard same term used for steel rods driven into the strata as a temporary support for cross timbers.
Also the CM legislation used to make reference to use of a "Bull, Drag or Other Appliance" to stop runaway skips in event of a rope breakage.
Regards
John
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