(a) What are canal rays ? Who discovered them ? What is the charge and mass of canal ray ? (b) How are the canal rays different from electrons in terms of charge and mass?

(a) New radiations in a gas discharge tube which are positively charged. E.Goldstein discovered them. Charge son canal rays is positive and mass is one unit.
(b) Electrons are negatively charged and mass approximately is 1/2000 that of canal rays.