Inveatl,atlon of the ratio of avera,e multlpllclt, in proton-emul&lon to that In protonproton Interactions at the same eneray. Instrument An emulsion stack consist. of. 50 nuclear r..,.,' emulsion pellicl •• of slza IOcm x 4cm x Total amount of nuclear ••ul.lon 1$ about 120 _I. Conditions de'lred The proton beam densIty of 6 x 10· protons /cm~ 11 des I red. The boam onot,y Is higher the belter. '3