Apparatus for Recording Neutral Particles by Reference to Decay Gamma Quanta.- Magnetic Spectrometer for Charged Particles.- Experimental Method of Determining the Efficiency Function of an Apparatus Containing a Magnetic Spectrometer.- Positive Pion Stopping Detector.- Absolute Sensitivity of a Thick-Walled Graphite Ionization Chamber for 1-GeV Photons.- Statistics of Time Measurements Made by the Scintillation Method.- A Cathode Stage with Amplified Feedback and Its Applications.- Wilson Chamber for Studying Photomeson Processes.- Relative Monitor for a Wilson Chamber.