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From the 60 year anniversary Merc calendar - a scan of some guy with a cigar using a chainsaw - Attachment 351918
...Testing an unusual blade type... (Don't forget to click on the top photo bar, to enlarge the photo to full size.)http://www.screamandfly.com/attachme...8&d=1470754429
]...Testing an unusual blade type... (Don't forget to click on the top photo bar, to enlarge the photo to full size.)
I think that is whats known as a limbing chain - offers additional protection should the operator slip while walking on a downed tree cutting limbs off - and not the operator's limbs!
http://www.screamandfly.com/attachme...8&d=1470754429[/QUOTE]
It's called a bow saw or bow blade. It was used primarily by southern pulp loggers as they could walk up to a fallen tree and plunge cut tree to lengths. It was banned back in the late 80" due to kick back issues and the injuries from them.