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I acquired this rack from Pigeon Mountain Industries in the 1970s, but I do not have a record of when or from whom.
My PMI Long, Version A rack is 328 mm. tall, 62 mm. wide, 26 mm. thick, and weighs 746 g. The frame is made from 9.5 mm. stainless steel bent into shape, with an internal width of 33 mm. and a 26 mm. diameter coiled eye. There are six brake bars. I bought this rack with hollow steel bars, but replaced the second bar with a worn SMC brake bar to help keep the rope centered. The original bars were 19 mm. in diameter and 63 mm. long. Allowing 45 mm. for the rope gives a 67 mm. range for spreading the bars.
This is a standard length rack of classical design. The steel bars are somewhat faster than aluminum bars. They don't leave a black aluminum oxide streak on the rope (in those days, PMI rope was white), but so what? The oxide does not appreciably affect the strength of the rope, nor does it appreciably cause the rope to wear out any sooner.
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I acquired this rack used on eBay from Gene Clinger in 2008.
My PMI Long, Version B rack is 326 mm. tall, 64 mm. wide, 22 mm. thick, and weighs 643 g. The frame is made from 9.5 mm. stainless steel bent into shape, with an internal width of 34 mm. and a 26 mm. diameter coiled eye. There are six SMC brake bars on this rack. The bars are 19 mm. in diameter and 64 mm. long. Allowing 45 mm. for the rope gives a 70 mm. range for spreading the bars.
This rack was designed to accept standard carabiner brake bars. In those days, carabiners had standard sizes, so did racks, and brake bars were dirt cheap.
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I acquired this rack from Pigeon Mountain Industries in the 1970s, but I do not have a record of when or from whom. I probably got it and Long Version A at the same time.
My PMI Short rack is 290 mm. tall, 62 mm. wide, 28 mm. thick, and weighs 557 g. The frame is made from 9.5 mm. stainless steel bent into shape, with an internal width of 33 mm. and a 26 mm. diameter coiled eye. There are five PMI brake bars. The bars are 19 mm. in diameter and 61 mm. long. Allowing 45 mm. for the rope gives a 32 mm. range for spreading the bars.
PMI made this shorter version designed for five bars. This is more compact, but has decreases the available range of friction. Treat it as a constant friction device.
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