Rudolf Gundlach (1892–1957) was a Polish military engineer, inventor and

tank A tank is an armoured fighting vehicle intended as a primary offensive weapon in front-line ground combat. Tank designs are a balance of heavy firepower, strong armour, and good battlefield mobility provided by tracks and a powerful engin ...

designer. He headed the design division of the Armored Weapons Technical Research Bureau (''Biuro Badań Technicznych Broni Pancernych''). He held the military rank of major in the Corps of Engineers of the Polish Army. He was the chief designer of the '' Ursus wz. 29'' armored car and supervised design work for the ''

7TP The 7TP (''siedmiotonowy polski'' - 7-tonne Polish) was a Polish light tank of the Second World War. It was developed from the British Vickers 6-ton. A standard tank of the Polish Army during the 1939 Invasion of Poland, its production did not e ...

'' light tank and the '' 10TP'' fast tank prototype.

Early life

Rudolf Gundlach was born on 28 March 1892 in

Wiskitki Wiskitki is a town in Żyrardów County, Masovian Voivodeship, in central Poland. It is the seat of the gmina (administrative district) called Gmina Wiskitki. It is located approximately north-west of Żyrardów and west of Warsaw. The town ...

Russian Empire The Russian Empire was an empire and the final period of the Russian monarchy from 1721 to 1917, ruling across large parts of Eurasia. It succeeded the Tsardom of Russia following the Treaty of Nystad, which ended the Great Northern War. ...

(now

Poland Poland, officially the Republic of Poland, is a country in Central Europe. It is divided into 16 administrative provinces called voivodeships, covering an area of . Poland has a population of over 38 million and is the fifth-most populous ...

) into an

Evangelical Evangelicalism (), also called evangelical Christianity or evangelical Protestantism, is a worldwide Interdenominationalism, interdenominational movement within Protestantism, Protestant Christianity that affirms the centrality of being "bor ...

family. His father was a

pastor A pastor (abbreviated as "Pr" or "Ptr" , or "Ps" ) is the leader of a Christian congregation who also gives advice and counsel to people from the community or congregation. In Lutheranism, Catholicism, Eastern Orthodoxy, Oriental Orthodoxy and ...

. From 1903 to 1911, he attended a classical gymnasium in

Łódź Łódź, also rendered in English as Lodz, is a city in central Poland and a former industrial centre. It is the capital of Łódź Voivodeship, and is located approximately south-west of Warsaw. The city's coat of arms is an example of canti ...

, and then entered the

Riga Technical University Riga Technical University (RTU) ( lv, Rīgas Tehniskā universitāte) is the oldest technical university in the Baltic countries established on October 14, 1862. It is located in Riga, Latvia and was previously known as 'Riga Polytechnical Instit ...

where he studied until his conscription into the

Russian Army The Russian Ground Forces (russian: Сухопутные войска �В Sukhoputnyye voyska V, also known as the Russian Army (, ), are the Army, land forces of the Russian Armed Forces. The primary responsibilities of the Russian Gro ...

in 1916. He graduated from a non-commissioned officers school of artillery and served in the 8th Heavy Artillery Brigade. In mid-1917, he became a member of the Union of Military Poles in

Tartu Tartu is the second largest city in Estonia after the Northern European country's political and financial capital, Tallinn. Tartu has a population of 91,407 (as of 2021). It is southeast of Tallinn and 245 kilometres (152 miles) northeast of ...

. He organized an artillery unit for the Polish I Corps.

Interwar Poland

Gundlach enlisted into the Polish Army in November 1918. After graduating from the Automotive Officers School in

Kraków Kraków (), or Cracow, is the second-largest and one of the oldest cities in Poland. Situated on the Vistula River in Lesser Poland Voivodeship, the city dates back to the seventh century. Kraków was the official capital of Poland until 1596 ...

in October 1919, he served as an adjutant in the Automotive Command Center in Łódź. He was appointed lieutenant in December 1919 and commanded a column of military vehicles during the

Polish–Soviet War The Polish–Soviet War (Polish–Bolshevik War, Polish–Soviet War, Polish–Russian War 1919–1921) * russian: Советско-польская война (''Sovetsko-polskaya voyna'', Soviet-Polish War), Польский фронт (' ...

. In 1925, Gundlach finished his studies at the Faculty of Mechanical Engineering of the

Warsaw University of Technology The Warsaw University of Technology ( pl, Politechnika Warszawska, lit=Varsovian Polytechnic) is one of the leading institutes of technology in Poland and one of the largest in Central Europe. It employs 2,453 teaching faculty, with 357 professor ...

, but failed to obtain the engineer's degree (he didn't take the diploma exam). In January 1930, he was promoted to the rank of captain, and in 1937 to the rank of major. In

interwar Poland The Second Polish Republic, at the time officially known as the Republic of Poland, was a country in Central and Eastern Europe that existed between 1918 and 1939. The state was established on 6 November 1918, before the end of the First World ...

, he worked in the Engineering Department of the Ministry of Military Affairs, as a clerk in the Institute of Engineering Research, and from 1931, was the head of the Armored Weapons Construction Bureau in the Army Research Institute for Engineering. In December 1934, he became the head of the Design and Construction Department in the Armoured Weapons Technical Research Bureau. He remained at this position until the outbreak of

World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposin ...

. He was decorated with the

Silver Cross of Merit The Cross of Merit () is a Polish civil state decoration established on 23 June 1923, to recognize services to the state. History At the time of its establishment in 1923, the Cross of Merit was the highest civilian award in Poland. It was aw ...

France

After the fall of Poland in 1939, Gundlach was one of hundreds of thousand Polish soldiers, technicians, scientists and engineers who escaped to France via Romania. In France he worked in the Bureau of War Industry (''Biuro Wojennego Przemysłu przy Ministerstwie Przemysłu''), and in the Ministry of Industry of the

Polish Government in Exile The Polish government-in-exile, officially known as the Government of the Republic of Poland in exile ( pl, Rząd Rzeczypospolitej Polskiej na uchodźstwie), was the government in exile of Poland formed in the aftermath of the Invasion of Pola ...

. After the

fall of France The Battle of France (french: bataille de France) (10 May – 25 June 1940), also known as the Western Campaign ('), the French Campaign (german: Frankreichfeldzug, ) and the Fall of France, was the German invasion of France during the Second World ...

, health problems prevented him from evacuating to Great Britain and he stayed in

Vichy France Vichy France (french: Régime de Vichy; 10 July 1940 – 9 August 1944), officially the French State ('), was the fascist French state headed by Marshal Philippe Pétain during World War II. Officially independent, but with half of its ter ...

for the remainder of the war. After the end of World War II, Gundlach sought enforcement of intellectual property rights over his periscope, which had been copied in several countries and produced under different names. He was unsuccessful in the

United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...

due to long and costly court proceedings, but managed to obtain a license fee from the British Royal Commission. He received a large payment for his periscope patent from some of its producers. In 1947, he gained compensation from the British authorities, and a French court awarded him 84 million francs for the use of his invention by Barbier-Bernard. After paying the attorney's fees, court costs, and taxes, he was left with 17 million francs, which allowed him to buy a villa in

Le Vésinet Le Vésinet () is a suburban commune in the Yvelines department in the Île-de-France region in north-central France. It is a part of the affluent outer suburbs of western Paris, from the centre of Paris. In 2019, it had a population of 15,943. ...

near

Paris Paris () is the capital and most populous city of France, with an estimated population of 2,165,423 residents in 2019 in an area of more than 105 km² (41 sq mi), making it the 30th most densely populated city in the world in 2020. S ...

. He established a bakery in 1953. His house served as a meeting place for Polish immigrants. He sold it in 1956 and moved to

Colombes Colombes () is a commune in the northwestern suburbs of Paris, France. It is located from the centre of Paris. In 2019, Colombes was the 53rd largest city in France. Name The name Colombes comes from Latin ''columna'' (Old French ''colombe'') ...

, where he died on 4 July 1957 and was buried at the local cemetery.

Gundlach Rotary Periscope

He is famous for his invention of the Gundlach Rotary Periscope ( pl, Peryskop obrotowy Gundlacha), patented in 1938, which made possible 360° vision. The periscope enabled an observer (e.g., the tank commander) to look forward (upper panel of the picture) or backward (lower panel) without moving his seat. Since it greatly increased the comfort of observer and widened the

field of view The field of view (FoV) is the extent of the observable world that is seen at any given moment. In the case of optical instruments or sensors it is a solid angle through which a detector is sensitive to electromagnetic radiation. Humans a ...

, the new periscope design was used in virtually every tank built after 1940. It was first implemented in

TKS The TK (TK-3) and TKS were Polish tankettes developed during the 1930s and used in the Second World War. Design and development The TK (also known as the TK-3) tankette was a Polish design produced from 1931 based on the chassis of the British C ...

and 7TP Polish tanks. As a part of Polish-British pre-war military cooperation, the patent was sold to

Vickers-Armstrong Vickers-Armstrongs Limited was a British engineering conglomerate formed by the merger of the assets of Vickers Limited and Sir W G Armstrong Whitworth & Company in 1927. The majority of the company was nationalised in the 1960s and 1970s, w ...

for one Polish Zloty / 1 PLN /. It was produced as

Vickers Tank Periscope MK.IV The Gundlach Periscope, usually known under its British designation as Vickers Tank Periscope MK.IV, was a revolutionary invention by Polish engineer Rudolf Gundlach, manufactured for Polish 7TP tanks from the end of 1935 and patented in 1936 as ...

(pictured), and built into all British tanks (such as Crusader,

Churchill Sir Winston Leonard Spencer Churchill (30 November 187424 January 1965) was a British statesman, soldier, and writer who served as Prime Minister of the United Kingdom twice, from 1940 to 1945 during the Second World War, and again from 1 ...

, Valentine,

Cromwell Oliver Cromwell (25 April 15993 September 1658) was an English politician and military officer who is widely regarded as one of the most important statesmen in English history. He came to prominence during the 1639 to 1651 Wars of the Three Ki ...

). After the

fall of Poland The invasion of Poland (1 September – 6 October 1939) was a joint attack on the Republic of Poland by Nazi Germany and the Soviet Union which marked the beginning of World War II. The German invasion began on 1 September 1939, one week afte ...

Germany Germany,, officially the Federal Republic of Germany, is a country in Central Europe. It is the second most populous country in Europe after Russia, and the most populous member state of the European Union. Germany is situated betwe ...

USSR The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, it was nominally a federal union of fifteen nationa ...

and

Romania Romania ( ; ro, România ) is a country located at the crossroads of Central Europe, Central, Eastern Europe, Eastern, and Southeast Europe, Southeastern Europe. It borders Bulgaria to the south, Ukraine to the north, Hungary to the west, S ...

captured equipment, allowing them to copy the invention. In the USSR, the Gundlach periscope was known as MK-4 and implemented in all tanks (including the T-34 and T-70). All Axis tanks and APC (including tanks of Italy, Romania, Hungary, Finland and Japan) were equipped or retro-fitted with this periscope until 1941. The technology was later transferred to the USA and implemented as the M6 periscope in all US tanks (M3/M5 Stuart, M4 Sherman and others). After the Second World War the technology was adopted thorough the whole world. Even today, original Gundlach periscopes are used in some tanks and APCs.

References

Bibliography

* Grzegorz Łukomski and Rafał E. Stolarski, ''Nie tylko Enigma... Mjr Rudolf Gundlach (1892-1957) i jego wynalazek'' (Not Only Enigma... Major Rudolf Gundlach (1892-1957) and His Invention),

Warsaw Warsaw ( pl, Warszawa, ), officially the Capital City of Warsaw,, abbreviation: ''m.st. Warszawa'' is the capital and largest city of Poland. The metropolis stands on the River Vistula in east-central Poland, and its population is officia ...

London London is the capital and largest city of England and the United Kingdom, with a population of just under 9 million. It stands on the River Thames in south-east England at the head of a estuary down to the North Sea, and has been a majo ...