From TOP to BOTTOM:
1) Typical Turko-Mongol saber of the Yuan Dynasty (1279-1368). The ancestor of the goosequill and willow leaf sabers of later dynasties. The goosequill saber and willow leaf saber were to be used by the military and civilians alike.
2) Goosequill saber (yanmaodao) of the Ming and middle Qing Dynasties (1368-1800?). The blade is straight until the curve begins around the centre of percussion. The center of percussion is the point on the blade with the least vibration on hard contact, the spot on the blade that transmits the most power to the target in a hard chop. This type of sword seems to have lost its popularity by the end of the 18th century.
3) Willow leaf saber (liuyedao) of the Ming and Qing Dynasties (1368-1911). It is characterised by the blade having a gentle curve throughout its length. The steepness of the curve increases as it moves towards the tip.
4) Oxtail saber (niuweidao). It originated in the late Qing Dynasty and was used exclusively by civilians and not by the Qing military. Commonly known today as " the Chinese Broadsword ".
5) The typical jian of the Ming and Qing Dynasties (1368-1911), commonly used by civilians.

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1) Goosequill saber (supposedly owned by Manchu founder Nurhachi)
2) Imperial Willow leaf saber
3) Civilian Oxtail saber (posted by William Reinman on swordforum and dated by Scott circa 1865)
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Below is an article posted on the old swordforum several years by Alexander Chin , about the evolution and characteristics of Chinese sabers of the Ming and Qing Dynasties, written by Scott Rodell and Philip Tom, and first published in a private exhibition catalog on Chinese swords in 1999.
CHINESE SABER TYPES
Below is an excerpt from an AN INTRODUCTION TO CHINESE SABERS: THE PEIDAO OF THE MING THROUGH QING DYNASTIES, by Philip Tom and myself that gives some detail concerning the standard and really only swords being used in any number during the last two dyansties. It was published in "Sword & Brush" a show catalog for an exibition of the same name organized two years ago in Washington, DC by the Great River Taoist Center (www.grtc.org) to celebrate the school's 15th Anniversary. "Sword & Brush" is really the only thing that's been published with acurate information on Chinese Arms of the Ming and Qing periods. Unfortunately, it is out of print. But don't despair, this weekend I will be in San Fransico to meet with the SFI gang and one of things on our agenda is the reissue of "Sword & Brush".
-Scott M. Rodell
Excerpt-
The YANMAODAO has a blade which is essentially straight up until the beginning of the backedge, at which point the cutting edge begins a gentle curve to a slightly upswept tip (cat. D-012, D-037). Of all forms of peidao, it is stylistically the most archaic because its shape is so influenced by the zhibeidao of earlier times.
The yanmaodao was designed to combine the best features of both the curved saber and straight sword. The arc of the cutting edge towards the point, as well as the thickness of the blade's back, enabled a swordsman to deliver more penetrating cuts than he could with the straight, double-edged jian. Yet the lack of curve for most of its length, plus the double-edged tip afforded by the back-edge, enabled him to execute both long thrusts and short "pointing" jabs that he would not be able to perform effectively with a more curved blade.
Surviving specimens and portrayals in art indicate that the yanmaodao was quite widely used in China from the Ming through the first half of the Qing. It appears to have lost popularity by the 19th cent., and is now little-known among students of martial arts. Perhaps the reason for its decline was that Chinese sword schools developed preferences for more specialized weapons, whose strong points fulfilled the needs of their particular fighting systems. In the world of swords, the design requirements for optimal cutting and thrusting efficiency are on opposite poles. A blade design that attempts to combine the attributes of sword and saber will achieve a "mid-range" versatility at the expense of the strong points at either end of the spectrum.
The willow-leaf saber or LIUYEDAO also made its debut during the Ming. It is characterized by a narrow but fairly stiff blade, tapering towards the point, and with a gentle curve which begins ahead of the forte (cats. D-014, D-016, D-025, etc.) Generally, the blades are grooved and are provided with a backedge. The somewhat greater curve of the liuyedao makes it a better cutting weapon than the yanmaodao although it changes the balance sufficiently to make it less accurate for the thrust.
Liuyedao were perhaps the most widely-used sabers in Chinese history. Beginning in the Ming Dynasty, they became the sidearm of choice for military men in all branches of the service, and retained this status until the fall of the Qing in 1911. Simple, stout versions saw action from the jungles of Taiwan to the snowy heights of the Himalayas to the sands of Central Asia. Sumptuously-decorated ones graced the parade regalia of two dynasties and were presented as gifts to tributary peoples (cat. D-023 and D-016 respectively). It is not difficult to understand this weapon's enduring appeal. The blade is well-suited for powerful, slashing cuts delivered either on foot for from the saddle. Its moderate arc makes it a usable thrusting implement as well.
Both sabers discussed up to this point have narrow blades. There is a third type, the piandao, whose blade is much more curved than that of a liuyedao. It first appears in military textbooks during the Ming, where it is called yaodao. By the Qing, the term piandao (which means "slicing saber") came into use (cat. D-038). Its name, and blade shape, indicate that its was primarily intended to inflict long, slicing cuts at very close quarters. There is an obvious parallel between this saber and the shamshir and talwar of Persia and India, respectively. It is probable that the concept was adopted by the Chinese after contact with these peoples. However, it did not prove especially popular in China. Aside from its employment by skirmishers (also equipped with rattan bucklers) during the 18th cent., it saw no widespread military use. Specimens are rarely encountered today.
During the late Qing Dynasty, sometime around the mid-19th cent., there appeared the fourth major type of Chinese saber, the NIUWEIDAO or "ox-tail" saber" (cat. D-017). It differs from the other forms in that its blade is much wider over all, and more importantly,the width increases away from the forte and then tapers to a point. Also, its grip is almost always downward-curving, as opposed to the other types of sabers which may have straight or curved hilts. This is the type of saber which is most commonly associated with China in the minds of martial arts students and movie-goers. However, the historical record shows that the niuweidao has the shortest history of the various types, and did not serve as a military-issue weapon during the Imperial period. It was developed by civilians, in the milieu of the proliferating martial arts schools of the 19th century when numerous rebellions wracked the country. These rebellions were most often fought, not by trained military men skilled in the use of arms, but peasants. Lacking the hours of practice required for delivering acurate cuts with a liuyedao or yanmaodao, peasants most likely opted for the heavier, more damaging cuts of the niuweidao.
The ox-tail saber must be considered separately from the other broad-bladed, falchion-like weapons with clipped points which were largely used by peasants for centuries. Its precise origin is still uncertain. It definitely has no antecedents in the Eurasian steppe nomad tradition which gave rise to the yanmaodao and the liuyedao. There is a resemblance between it and the blades on certain polearms used in Vietnam in the early 19th century However, it does not appear as though the Vietnamese themselves developed a version of this blade mounted as a saber. Examples of niuweidao found in Vietnam appear to have been brought in by Chinese immigrants. At present, we can consider the oxtail saber to be an indigenous Chinese development. Unfortunately, we do not know the region in which it made its first appearance in China.
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Generally speaking, the Ox Tail is a saber favored for less skilled swordsmen because it can deliver a more powerful cut than the Willow Leaf of Goose Quill Sabers. In other words, if you're removing pounds of flesh, its less important where you cut. Accordingly, it was favored by martial artists with less time for training, ie peasants, tradesmen, etc. vs. professional military, body guards and so on.
We probably see most contempory students of Chinese Martial Arts practicing with the Ox Tail Saber instead of the older & historically more midely used, Willow Leaf & Goose Quill Sabers, because of the surge in Martial Arts Societies amongst the general population during the 19th Century in response to the above mentioned rebellions, in response to foreign agression & colonialization, & a need by the general population to protect themselves from the Qing military as much as from bandits.
I am bringing period Qing examples of all three saber types, as well as other weapons to my SFI Chinese Swordsmanship Seminar in San Francisco this June. Students atending will have the oportunity to handle these weapons & feel for themselves how each plays.
Scott M. Rodell
Most of the combat arts loosely called "kung fu" systems evolved outside the military context in late Imperial China (Ming and Qing Dyn.). The niuweidao appears to be a development rooted in this milieu. My research has not found, to date, any documented use of the niuweidao within the ranks of the Imperial armed forces. Period iconography shows use of the liuyedao and an earlier form, the yanmaodao (goose quill saber). Furthermore, niuweidao are not illustrated in the mid-18th c. compendium of regulations, the HUANGCHAO LIQI TUSHI. This publication shows that of the true sabers ("peidao") designed for use with one hand, the standard types for military use and court regalia are the liuyedao and a somewhat rare form called the piandao.
Of course, one must keep in mind that by the 19th c., ad hoc militias were often raised on a local level to assist the regular forces in one way or another. The men would have been recruited from town or village, and little or no attempt was made to standardize or integrate weapons and training with those of the regular forces. Under such circumstances, it is entirely possible that niuweidao may have seen action in a military context, in the hands of these irregular fighting forces on the government side.
The other civilian element in the martial arts world would be the scholars and literati. These men embodied a personal style which emphasized refinement and elegance. Archery and the use of the jian, or straight, double edged sword, had strong appeal in this social class.
In late Imperial China, the state relied primarily on professional standing armies based on hereditary staffing, with additional conscription from the populace in times of emergency. There was no universal conscription as was the case of Europe up til the 20th c., and the feudal system of military organization (such as was used in Japan) was not followed. During the Qing Dyn., the military was multiethnic (Manchus, Chinese, Mongols plus a smattering of Koreans and even Russians in the "Eight Banners", and all Chinese in the "Army of the Green Standard"). In all these units, soldiers expected their sons to follow them into the ranks. Weapons, dress, and gear were standardized, and combat training seems to have adhered to the norms established by the Mongols (for mounted archery technique) and the military manuals written by the Ming general Qi Jiguang (gunnery, boxing and close combat weapons). Socially, the military tended to live apart from the general population, in garrisons or in agro-military colonies (much like the Roman experience). We can see from all this how the military and civilian traditions of fighting arts were eventually to diverge in the last centuries of Imperial rule.
Phillip Tom
The Ox Tail Saber is generally refered to as a civilian saber because it was never issued to, or carried by Imperial Troops. Unfortunately, every movie you see, including those like "Crouching Tiger, Hidden Dragon", which did such a geat job of historical accuracy in settling & costume, arm soldiers with off the rack junk from the local wushu shop. From examination of existing Ming & Qing examples, we know that the Ox Tail Saber did not appear until sometime in the late 18th century at earliest. At that time there was less of a differential between the width at the forte & the width towards the tip. This differential increased as time passed so that we can generally date Ox Tails as early or later 19th century by their form. Ox Tail Sabers appeared in greatest numbers during the mid-19th century when the Qing dynasty was nearly over thrown by the Taiping Rebellion as well as other large scale revolts (the dynasty never really recovered from these uprisings).
Scott M. Rodell
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Thomas Chen: One point of interest is that the Qing Imperial Documents on armaments details of certain garrisons and the 8 Banners which I have copies of do not specifically mention single-handed sabers as liuyedao or yanmaodao..... They just use the generic term yaodao or "waist saber"...