A land mine is an explosive device concealed under or on the ground and designed to destroy or disable enemy targets, ranging from combatants to vehicles and tanks, as they pass over or near it. Such a device is typically detonated automatically by way of pressure when a target steps on it or drives over it, although other detonation mechanisms are also sometimes used. A land mine may cause damage by direct blast effect, by fragments that are thrown by the blast, or by both.
A calorimeter is an object used for calorimetry, or the process of measuring the heat of chemical reactions or physical changes as well as heat capacity. Differential scanning calorimeters, isothermal micro calorimeters, titration calorimeters and accelerated rate calorimeters are among the most common types. A simple calorimeter just consists of a thermometer attached to a metal container full of water suspended above a combustion chamber. It is one of the measurement devices used in the study of thermodynamics, chemistry, and biochemistry.
An anti-tank mine is a type of land mine designed to damage or destroy vehicles including tanks and armored fighting vehicles.
The German S-mine, also known as the "Bouncing Betty" on the Western Front and "frog-mine" on the Eastern Front, is the best-known version of a class of mines known as bounding mines. When triggered, these mines are launched into the air and then detonated at about 1 meter (3 ft) from the ground. The explosion projects a lethal spray of shrapnel in all directions. The S-mine was an anti-personnel mine developed by Germany in the 1930s and used extensively by German forces during World War II. It was designed to be used in open areas against unshielded infantry. Two versions were produced, designated by the year of their first production: the SMi-35 and SMi-44. There are only minor differences between the two models.
The M16 mine is a United States-made bounding anti-personnel mine. It was based on captured plans of the World War II era German S-mine and has similar performance. The mine consists of a cast iron body in a thin steel sleeve. A central fuze well on the top of the mine is normally fitted with a pronged M605 pressure/tension (tripwire) fuze. Sufficient pressure on the prongs or tension on an attached tripwire causes the release of a striker. The freed striker is forced into a percussion cap which ignites a short pyrotechnic delay. The purpose of this delay is to allow the victim to move off the top of the mine, to prevent its upward movement from being blocked. Once the delay has burned through, a 4.5-gram black powder charge is ignited, which launches the inner iron body of the mine up into the air. The charge also ignites a second pair of pyrotechnic delays.
The PMD-6, PMD-7 and PMD-57 series mines are Soviet Union blast-type anti-personnel mines that consist of a wooden box with a hinged lid with a slot cut into it. The slot presses down against a retaining pin, which holds back the striker. When sufficient pressure is applied to the lid of the box the retaining pin moves, allowing the striker to hit the detonator. The mines typically have an operating pressure of 1 to 10 kg. All the mines in the series use MOV series fuzes.
The M7 is a small, metal-cased United States anti-tank blast mine that was used during the Second World War. It was based on the British Hawkins grenade. Approximately 2.5 million were produced before production ceased, and although it has long since been withdrawn from U.S. service, it can be found in Angola, Burma, Cambodia, Chad, Eritrea, Ethiopia, Korea, Lebanon, Myanmar, Somalia, Thailand, and Zambia.
The M23 is a United States steel cased chemical landmine. The mine was developed in the late 1950s and early 1960s, and approximately 100,000 units were produced. The U.S. completed its destruction of its stock at the Umatilla Chemical Depot in 2008 and the Johnston Atoll Chemical Agent Disposal System in 2000.
The M21 is a circular United States anti-tank landmine that uses a Misznay Schardin effect warhead. The mine uses an M607 pressure fuse, which can be adapted as a tilt rod fuze. The mine is triggered either by pressure, or by the tilt rod being forced beyond 20 degrees from the vertical by a force of more than 1.7 kg, either of these actions results in pressure being transferred via a bearing cap to a Belleville spring, which inverts, driving the firing pin into the M46 detonator. The M46 charge first ignites a black powder charge, which blows off the mine's cover, and clears any earth or debris that may have been on top of the mine. A fraction of a second later the main warhead detonates, driving and compressing a steel plate upwards, with enough force to penetrate 76 mm of armour at a distance of 530 mm. Approximately 200,000 M21 mines were produced in the U.S. and licensed copies, the K441 and K442, were produced in South Korea.
The P2 Mk2 and P3 Mk2 are Pakistani plastic cased minimum metal anti-tank blast mines. The P2 Mk2 has a square case with a central circular ribbed pressure plate, the P3 is circular with a central circular pressure plate. Both mines use anti-personnel mines as the fuse, typically the either the P4 Mk1 or P2 Mk2 anti-personnel mines. The anti-personnel mine sits in a cavity below the pressure plate, when enough pressure is place on the pressure plate of the mine, it collapses onto the anti-personnel mine triggering it and the main charge which sits below it. A yellow canvas carrying strap is normally fitted to the side of the mine. The mines have a secondary fuse well on the bottom which can be used with anti-handling devices. A GLM-2 electronic booby trap can be fitted to the cavity under the pressure plate. The mine is supplied with a steel disc which makes the mine more easily detectable, although this is seldom used. Since 1997 only a detectable version of the mine has been produced, and to comply with the Convention on Conventional Weapons amended protocol II, Pakistani stocks of the mine are being retrofitted with steel detection discs. The mines are found in Afghanistan, Angola, Eritrea, Ethiopia, Pakistan, Somalia, and Tajikistan.
The Valmara 59 is a large cylindrical Italian bounding anti-personnel mine. It is the first in the "Valmara" family of mines produced by Valsella Meccanotecnica, and was followed by the Valmara 69 and VS-JAP. The mine's body is metal with a distinctive five-pronged head. The central prong has a hole, to allow the threading a trip wire. The inner body of the mine has a main charge surrounded with approximately 1,000 steel cubes, below which is a steel wire connecting it to the base of the mine. When the mine is triggered a small charge launches the mine into the air approximately 45 cm before the steel wire is pulled taut, the jolt of which pulls a striker into the detonator. A secondary time fuse triggers the mine after three seconds if it has not detonated after being triggered.
The PDM amphibious mines are series of Soviet anti-vehicle mines that could be used on or in beaches, rivers, lakes and shallow coastal waters up to five meters deep.
The AUPS is a circular Italian bakelite cased minimum metal anti-personnel blast mine. The mine can be adapted with a steel fragmentation jacket and stake into a fragmentation stake mine. The mine is constructed in two halves, with the upper half containing the pressure fuse mechanism, the lower half contains the main charge and the detonator. The mine case is normally unpainted bakelite brown.
The NR-413 is a Belgian trip wire activated anti-personnel stake mine. The main body of the mine is wine bottle shaped, with an NR 410 tripwire fuse screwed into a fuse well on the top of the mine. Under the fuse well is a detonator and a row of booster pellets. Wrapped around the detonator and booster pellets is the main charge. An internally square cross-sectioned steel wire is coiled around the outside of the mine, which give a fragmentation effect. The mine produces 600 fragments with a velocity of approximately 1,660 metres per second. It has an effective range of around 15 metres. A variant is produced with a cast steel fragmentation jacket.
The YaM-5 was a Soviet anti-tank blast mine with a wood case. Various wood was used. The mine consists of a rectangular wooden box with a hinged lid that overlaps the front of the mine. A slot in the hinged lid's side through which an MUV pull fuse is placed. A wooden pressure bar is sometimes used on the edge of the lid above the slot. A nail is placed horizontally through the loop of the MUV fuse's striker retaining pin and two loops on the bottom of the lid's slot.
The TMD-40 was a wooden-cased Soviet anti-tank blast mine used during the Second World War. The mine consisted of a rectangular wooden box which contained a detonator assembly at each end and seven 400 gram and four 200 gram blocks of explosive. The fuse assemblies consisted of a lever device, which when pressed downward by pressure pieces attached to the lid of the mine, see-sawed upward, pulling the striker retaining pin from a pull detonator. The main charge was then triggered.
The M2 is a United States bounding anti-personnel mine used during World War II. A number of variants of the mine were produced and although the mine is no longer in US service, it can be found in Cyprus, Iran, Iraq, Korea, Laos, Oman, Rwanda, Tunisia and the Western Sahara. Copies of the mine were produced by Belgium, Pakistan (P7), Portugal (M/966) and Taiwan.
The Mle 1939 was a French bouncing anti-personnel mine used at the start of the Second World War, it was developed largely in response to the German S-mine bounding mine. It saw very little service before the fall of France. The plans escaped to the US via Major Pierre Delalande, a member of the French Corps of Engineers, and were used as the basis for the American M2 bounding mine which saw wider service during the war but was considered largely ineffective. The M2 mine was replaced almost immediately afterwards with the M16 bounding mine, an almost exact copy of the German S-mine. The French also later produced a copy of the S-mine, the Mle 1951 mine.
The Ministry of Steel is an executive branch agency of the Government of India that is responsible for formulating all policies regarding steel production, distribution and pricing in India. As of June 2019, the ministry is headed by a minister of cabinet rank, Dharmendra Pradhan and is assisted by a Minister of State, Faggan Singh Kulaste.
The A.P. Mine No. 3 was a British anti-personnel mine of World War II. The mine was developed and produced by the Royal Engineers in India due to a shortage of mines for the Burma campaign. The mine was simpler to lay than previous devices and could be placed by infantrymen, rather than sappers. The A.P. Mine No. 3 was a bounding shrapnel mine that was lethal at ranges of up to 30 yards (27 m).
