00281nam a2200109Ia 4500008004100000040001100041100001500052245003800067260004300105300001300148300001000161251112s9999||||xx |||||||||||||| ||und||  aCNCLSA  aH. R. Lang 0aJournal of Scientific Instruments  c1957bThe Institute of PhysicsaLondon  aP. 1-531  bV. 34