Having three major parts to measure electron for e/m by Helical Method, i.e. 1. Standard Solenoid of multi-turned layers fitted on wooden base. 2. Power supply, for cathode voltage to CRT. Provided with high resistance voltmeter, Also having solenoid supply with coarse and fine control arrangement, an ampare meter is used to measure current passing in solenoid. 3. Cathode Ray Tube mounted to moveable inner side of the standard solenoid.