Paris Gun

infobox weapon


caption = The German Paris Gun, also known as William's Gun, was the largest rail artillery gun of World War I. In 1918 the Paris Gun was able to shell Paris from 120 km (75 mi) away.
origin = Germany
type = Cannon
is_ranged = yes
is_bladed = no
is_explosive = no
is_artillery = yes
is_vehicle = no
is_missile = no
is_UK =
service =
used_by = Imperial Germany
wars = World War I
designer = Krupp
manufacturer = Krupp
weight = 256 tons
length = 28 m
cartridge =
caliber = 210 mm
action =
rate =
velocity = 1,600 m/s
range = 130 km
max_range =
feed =
sights =
breech =
recoil =
carriage =
elevation = 35 degrees
traverse =

The Paris Gun ( _de. Paris-Geschütz) was the name of an artillery piece with which the Germans bombarded Paris during World War I. This oversized railway gun was used from March to August 1918. When it was used, Parisians believed they were being bombed by a new type of high altitude zeppelin, because neither the sound of an airplane nor of a gun could be heard. It was the largest piece of artillery used during the war, and is considered to be a supergun.

Also called the "Kaiser Wilhelm Geschütz" ("Emperor William Gun"), it is often confused with Big Bertha, the howitzer used by the Germans against the Liège forts in 1914, and indeed the French called it by this name as well. [ This erroneous naming may be traceable in part to an article in "The Hearst International Magazine" in December, 1921, by Colonel Bauer; the Paris Gun was erroneously called the "Big Bertha" in the title of that article. Bull and Murphy, pp. 14, 19 ] It is also confused with the smaller "Langer Max" (Long Max) cannons from which it was derived. Although the famous Krupp-family artillery makers produced all these guns, the resemblance ended there.

As a military weapon the gun was not a great success: the payload was minuscule, the barrel had to be regularly replaced, and the accuracy was only good enough for city-sized targets. However, the German objective was to build a psychological weapon to attack the morale of the Parisians; not to destroy the city itself.

Decades later, the gun was an inspiration to advanced artillery developer Gerald Bull; he researched the history of the Paris Gun and published an extensive book about it.

Description

The Paris Gun was a weapon like no other, but its exact capabilities are not known with complete certainty; [ With the discovery (in the 1980s) and publication (in the Bull and Murphy book) of a long note on the gun written shortly before his death in 1926 by Dr. Fritz Rausenberger, who was in charge of its development at Fried. Krupp, we are now fairly certain of the details of its design and capabilities. ] this is due to the weapon's apparent total destruction by the Germans in the face of the Allied offensive. Figures stated for the weapon's size, range and performance may vary widely depending on the source — not even the number of shells fired is certain.

The gun was capable of hurling a 94 kilogram (210 lb) shell to a range of 130 kilometres (81 miles) and a maximum altitude of 40 kilometres (25 miles) — the greatest height reached by a human-made projectile until the first successful V-2 flight test in October 1942.

At the start of its 170-second trajectory, each shell from the Paris Gun reached a speed of 1,600 metres per second (5,200 ft/s).

The gun itself weighed 256 tons and was mounted on a special rail-transportable carriage mounted on a prepared concrete emplacement with a turntable. It had a 28 metre (92 ft) long, 210 millimetre (8.3 in) caliber rifled barrel, with a 6 metre (20 ft) long smoothbore extension. This barrel was placed inside a 38 cm Langer Max barrel, which in turn was placed on the carriage. The gun's barrel was braced to counteract barrel droop due to its length and weight, and vibrations while firing.

Since it was based on a naval weapon, the gun was manned by a crew of 80 Imperial Navy sailors under the command of an admiral. It was surrounded by several batteries of standard army artillery to create a "noise-screen" chorus around the big gun so that it could not be located by French and British spotters.

The projectile reached so high that it was the first human-made object to reach the altitude of the stratosphere. This virtually eliminated drag from air resistance, allowing the shell to achieve a range of over 130 kilometres (80 miles). The shells were propelled at such a high velocity that each successive shot wore away a considerable amount of steel from the rifled bore. Each shell was sequentially numbered according to its increasing diameter, and had to be fired in numeric order lest the projectile lodge in the bore, and the gun explode. Also, when the shell was rammed into the gun, the chamber was precisely measured to determine the difference in its length: a few inches off would cause a great variance in the velocity, and with it, the range. Then, with the variance determined, the additional quantity of propellant was calculated, and its measure taken from a special car and added to the regular charge. After 65 shells had been fired, each of progressively larger caliber to allow for wear, the barrel was sent back to Krupp and rebored to a caliber of 240 millimeters (9.4 in) with a new set of shells.

The Paris Gun was the largest gun built at the time, but it was surpassed in all respects but range in World War II by the Schwerer Gustav. The unfinished V-3 cannon and Iraqi super gun would have been bigger.

Use in World War I

.

The Paris gun was used to shell Paris at a range of 120 km (75 miles). The distance was so far that the Coriolis effect — the rotation of the earth — was substantial enough to affect trajectory calculations. The gun was fired at an azimuth of 232 degrees (west-southwest) from Crépy-en Laon, which was at a latitude of 49.5 degrees North. The gunners had to account for the fact that the projectiles landed to the right of where they would have hit if there were no Coriolis effect.

In total, about 320 to 367 shells were fired, at a maximum rate of around 20 per day. The shells killed 250 people and wounded 620, and caused considerable damage to property. The worst shelling was on 29 March 1918 when a single shell hit the roof of the Church of St. Gervais, collapsing the entire roof on to the congregation then hearing the Good Friday service. A total of 88 people were killed and 68 were wounded.

The gun was taken back to Germany in August 1918 as Allied advances threatened its security. The gun was never captured by the Allies. It is believed that near the end of the war it was completely destroyed by the Germans. One spare mounting was captured by American troops near Chateau-Thierry, but the gun was never found; the construction plans seem to have been destroyed as well.

The Paris Gun holds a significant place in the history of astronautics. In the 1930s, the German Army became interested in rockets for long range artillery as a replacement for the Paris Gun—which was specifically banned under the Versailles Treaty.

ee also

* Schwerer Gustav (similar WWII gun)
* Krupp K5 {"Anzio Annie"}

Further reading

* Henry W. Miller, "The Paris Gun: The Bombardment of Paris by the German Long Range Guns and the Great German Offensive of 1918", Jonathan Cape, Harrison Smith, New York, 1930
* Gerald V. Bull, Charles H. Murphy, "Paris Kanonen: The Paris Guns (Wilhelmgeschutze) and Project HARP", E. S. Mittler, Herford, 1988
* Ian V. Hogg, "The Guns 1914 -18", Ballantine Books, New York, 1971

Footnotes

External links

* [http://www.firstworldwar.com/atoz/parisgun.htm The Paris Gun] in the First World War.com Encyclopedia
* [http://home.att.net/~Berliner-Ultrasonics/ordsuper.html#parisgun Paris Gun at S. Berliner, III's ORDNANCE]
* Major J. Maitland-Addison, R.A., [http://sill-www.army.mil/FAMAG/1918/JUL_SEP_1918/JUL_SEP_1918_PAGES_321_341.pdf "The Long Range Guns" from Journal of the Royal Artillery, July, 1918]
* [http://html2.free.fr/canons/canparis.htm Une page sur le canon de Paris]