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Further reading □ Overview1968: Camper1970: Moving charges1970: OU Maths1970: Film producers1970: FOCUS1971: First Order Reactions1971: Reactions1971: Syntactic Dominoes1971: Square Well1971: Tomorrow's World1968-75: Galaxy Evolution1971: Symposium1972: When polar bears swam the Thames1972: Aerial Synthesis1973-81: Eilbeck1973: Physex 21973: HPD Queue1974: Orbits in a Hyperbolic Well1973-75: Galaxies1975: PIGS1975: Serpents Egg1975: Finite Elements1976: Alien
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Further reading

Overview
1968: Camper
1970: Moving charges
1970: OU Maths
1970: Film producers
1970: FOCUS
1971: First Order Reactions
1971: Reactions
1971: Syntactic Dominoes
1971: Square Well
1971: Tomorrow's World
1968-75: Galaxy Evolution
1971: Symposium
1972: When polar bears swam the Thames
1972: Aerial Synthesis
1973-81: Eilbeck
1973: Physex 2
1973: HPD Queue
1974: Orbits in a Hyperbolic Well
1973-75: Galaxies
1975: PIGS
1975: Serpents Egg
1975: Finite Elements
1976: Alien

Hough-Powell Device Queue

Alex Bell

1973

Alex Bell was one of the original staff at the Atlas computer Laboratory before he left to join CDC. Later he came back to work for the group of Ron Lawes at the Rutherford Laboratory that was scanning particle physics tracks using a Hough-Powell Device (HPD) driven by a Hewlett-Packard DDP 516 that was online to the Rutherford Laboratory mainframe. The flying spot scanner produces digital values for the coordinates of points where the scanning lines meet tracks on the photograph.

By 1973, the HPD1 and CYCLOPS film measuring machines were enhanced by HPD2, which became fully operational on spark chamber film during 1973. (See Annual Report) Film for two CERN experiments (ISR and S104) were measured in 1972, and results from the former presented at an international conference in September.

Alex produced this film to show the problems that arose due to the variable responses from the IBM 360/195 and the need to buffer both input and output to and from the device and its associated front-end computer.

It is the only CAMPER film of any length produced on the SC4020 that is still available.

HPD Queue
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