[T]he following criteria [determine] whether an employee was in the scope of his employment:
- Conduct of a servant is within the scope of employment if, but only if:
- It is of a kind he is employed to perform;
- it occurs substantially within the authorized time and space limits;
- it is actuated, at least in part, by a purpose to serve the master * * *
- Conduct of a servant is not within the scope of employment if it is different in kind from that authorized, far beyond the authorized time or space limits, or too little actuated by a purpose to serve the master.