Work in progress in the East experimental area of the PS 1961 This area (later covered by a Hall) was initially conceived as an open "apron". View looking East. PHOTOLAB

Beam extraction area of the PS East experimental zone 1964 PHOTOLAB

Construction of the East Hall 1962 East experimental area of the PS : the 'apron" is being covered by a hall. PHOTOLAB

The Large Bubble Chamber building takes shape 1961 East experimental area of the PS (view looking S-E) PHOTOLAB

O.sub(6) beam 1965 The O.sub(6) beam set up in the East experimental area supplied the 2 m hydrogen bubble chamber. PHOTOLAB

Aerial view of CERN, looking S-W 1963 Note in particular the completed East experimental area of the PS (center right). PHOTOLAB

East experimental area of the PS 1961 View towards the Jura : the "apron" with its service tunnel and slab. PHOTOLAB

East Hall under construction 1962 Presently Hall no 157, this experimental area was initially conceived as an open-air "apron". PHOTOLAB

East experimental area of the PS 1961 Building work is under way on the "apron" (view looking S-E). PHOTOLAB

PS East experimental area : casting the floor slab 1961 Initially conceived as an open-air slab, the concrete work required special technical solutions. PHOTOLAB

Surveyors at work on the PS East area 1961 Left to right : Marc Changeat and Jean Bruderlein measure the deformation of the floor under a 150 ton load. PHOTOLAB

PS South Hall area : view looking East 1957 View taken from "Mount Citron" - Also, under construction, present buildings Nos 8, 6 and 9. PHOTOLAB

View of the neutrino area 1967 View of the neutrino area at the end of the year. In the foreground is the roof of the NPA hall, in the upper part of the photograph the PS ring and the East hall. PHOTOLAB

Assembly of the "safety hydrogen sphere" for the liquid hydrogen bubble chambers 1961 Located in the S-E corner of the East experimental area of the PS, this sphere was meant to contain possible spills of hydrogen. PHOTOLAB

The "safety hydrogen sphere" nearly completed 1961 Located in the S-E corner of the East experimental area of the PS, this sphere was meant to contain possible spills of hydrogen. PHOTOLAB

Building work on the PS East experimental area 1961 View towards the Jura : on the right the nearly completed compressor Building (now No 252), while the foundations of the large bubble chamber hall (now No 156) have just been started. PHOTOLAB

PS beam ejection towards East Area 1975 From left one sees the PS line, the primary beam e13 from straight section 62 (slow ejection), the fast ejection system from straight section 58 (Annual Report 1975) PHOTOLAB

PS East experimental area : the left half of the hall is used for physics, the rest as storage space 1964 View looking towards the PS. Note (foreground, left to right) the vacuum tank and the piston test stand for the 2-m bubble chamber. PHOTOLAB

Assembly of optical spark chambers for the experiment NUE 1974 To continue the research on neutral currents after their discovery in Gargamelle in 1973, the Aachen-Padua Collaboration set up in the neutrino beam of the PS South-East Area, behind Gargamelle, an assembly of 150 optical spark chambers, 2x2 m2 extending over 8 m (experiment T230, NUE). Hans Reithler stands on the right. PHOTOLAB