Many of my climbing friends, French and English as well have been using the Machard knot most often in its "French variant"and many also did not know its name, quite a number just named it a Prusik.
Note also an "emergency" variant that you can do with a single cord, the "single loop Machard" similar to the Valdotain knot. The difference between the two being that the Valdotain is made with one end of a rope so with the same diameter than your rope (often cut from it) and so needing roughly many spires, often 7, while with the machard using a single cord of a smaller diameter you do not need as many spires.
Note also an "emergency" variant that you can make with a single strand cord, the "single strand Machard" similar to the Valdotain knot, this latter being much used by tree workers in its Braid variant (and in climbing it makes a good hauling system, for example when getting someone out of a crevasse). The difference between the two is that the Valdotain is made with one end of a rope so with the same diameter than your rope (often cut from it) and therefore needing many spires, often 6 to 7, while with the single loop Machard using a single cord of a smaller diameter you do not need as many spires. You need to secure the knot with a stopping knot such as a bowline.
I have seen on the Avrenchin climbing club's site that you have made a presentation on the Machard knot, so you probably could resolve the following quarrel that you can view on this link:
Everyone seems to agree about the identity of the prussik knot, invented by the Austrian Karl Prusik before 1931.
Two other auto-blocking knots (at least) exist whereby one winds up a cord around a climbing rope: one with the lower loop slipped through the upper loop before clipping a karabiner in it
(which blocks one way only); the second one with a karabiner slipped through directly in the two loops (whick blocks both ways).
So two questions:
1. which one was invented by Serge Machard andMy personal interest with this question is to advise an English guide and friend of mine who is writing a book on mountaineering."
2: What is the name of the other knot before that date?
This is André's answer:
The authentic Machard knot is the one where the karabiner is clipped into the two cord' loops (lower and upper loops parallel in the karabiner).
It is Serge who showed me this loop just after inventing it asking my opinion on its reliability. This was in 1961.
Climbing litterature employs usually the term "French knot" for the one where the lower loop is slipped through the upper one and where the karabiner is clipped in the lower one.
It is the proper way to distinguish between the two knots. To my knowledge the only auto-blocking/auto-jamming knot known and used in climbing before 1961 was the Prusik knot.
What comforts me with that idea is that at the time I knew many experienced climbers and alpinists of whom a number of ENSA teachers.
None did tell me about another auto-blocking knot than the Prusik's one.
Technical climbing books of the time did not mention any other as well.
Serge discovered his knot when he discovered the phenomenon that a cord loop winded up around a thicker rope does not slip and blocks itself when one pulls on the end loops.
This discovery and the resulting knot spread like wildfire among the climbing circles worldwide.
It is certain that the same would have happened with any other person who would have discovered and exploited the same phenomenon. The knot would have been given his name.No one would have heard of the Machard knot. It is therefore certain that Serge was the first to observe and exploit the phenomenon.For the same reason, it is certain that the "French knot" appeared after the Machard knot.
What is the difference between the Machard knot and the French knot?
Both use a cord winded up as a spiral around the climbing rope to secure.To obtain an auto-jamming effect, the spiral must have a slow enough pace, at least on a significant part of its lentgh when the device is in tension.With the Machard knot, the cord loop must have the "right" lentgh. If too small, the number of spirals may not be enough. If too long you may need a prohibitive number of spirals.The "French knot" does not have this problem. The loop's length is not correlated to the number of spirals.
I imagine that the discovery of the "French knot" was made by someone who, one day, wanted to make a Machard knot with too long a loop.Instead of continuing to wind up the cord, he had the idea to stop and had the rest passed in the initial loop.
I cannot exclude that this person was Serge. He certainly saw this issue caused by too long a loop before everyone else.
It is therefore possible that he also be the author of the "French knot". But I have no certainty.
Both knots are as valid. The fact that one blocks in two ways and not the other one is not a decisive factor. When one uses an auto-jamming knot, one knows in which direction the effort will be exercised.
Up to this day, no law, no decree, no text has taken pretence of their equivalence to make an obligation to use one more than another.
The quarrel concerning them is therefore less crucial than the one which opposed the Little-Endian to the Big-Endian in Jonathan Swift's famous novel.
This should reassure your friend and guide when writing his book..."
At dusk, they had climbed the route.Serge climbs down using his auto-jamming knot on an abseil to take off some pegs while his young friend (15 years old), Jean-Marie walks down the path to the foot of the climb...
Time goes by.
Serge does not climb back up.
Jean-Marie reaches the foot of the climb and find Serge's body, his neck broken.
Serge had just turned 18 years old.
(It seems that the peg on which he had put his abseil did break)
"On the evening of a climb of a level never reached in our Calanques, Serge left us. What mistake had he made, Serge, the specialist of security in climbing, in abseils, and the marvelous creator of the Machard knot? But this is an erroneous way of thinking: Serge did not make an error, but what he did had to happen.Remember your beginnings in climbing, how many unforgivable errors, all forgiven, how many foolish actions and no penalty... Often, providence endeavours to get us out of the critical situations our clumsiness and pride get us into - often in spite of ourselves!However, sometimes, providence refuses to give us a way out. COUZY had to receive this stone. GERVASUTTI - him! - had to grab one end only of his abseil; Serge had to leave us at the end of his magnificent feat.Human beings of his quality are a scandal for this mediocrity which is the common ground of us all and I believe that God has given alms in calling them prematurely to him in order that we can assume with not too much shame our laborious lifes.Look at you, climbers, my brothers: what gravity, what serious, what passion inhabit us! This merciless battle we sustain against gravity, how much cunning, how many tricks, how much slowness it demands on us? Nothing of this jumble with Serge. Of an astonishing ease, daring and grace, he overcame the toughest obstacles without any visible effort. The void was submitted to him as he had enchanted it by means of ligthness and subtelty. For him climbing was only a marvelous game - but he excelled at it. And as such he made no boasting of his feats. The importance we attach to them surprised him, nearly shocking him: Succeeding? Nothing more natural? Don't we play to win?He fell in the euphoria of his beautiful success, aware certainly to have pushed further the limits of the game. How heavy his inheritance is! With his example, his friendship, it is now up to us to progress on the way he cleared. He will remain for ever in our hearts.
François Régis Raybaud(Bulletin CAF Marseille 1962 N° 151)
Right hand roof of Sugiton - First ascent on the 16th June, in 15 hours by Serge MACHARD and Jean-Marie ROZIERE.
Exceptional route. Pitch 1. V+, 3 pegs. Pitch 2. Rope throw (2 meters) on a rock peck to overtake an important bulge, then A3, A2. Pitch 3, the trickiest. After a traverse to the right - 4 m V - a 5 m roof fully horizontal, with no crack but small holes : A4, A3, then a vertical section A1 and IV to the summit. Height of the route : about 50 m.