I just bought a 50+ year old house. I only ever grew up with electronic sprinkler controls, and so far I haven't been able to find any sprinkler controls in the new house. However, there are exposed pipes and drip heads coming out near various plants, so I know there is a sprinkler system (or at least has been).
The following photo is the closest I could find/guess would be a sprinkler control valve. Are these sprinkler control valves? If so, how do I turn them on? I haven't tried turning them very hard yet, but the caps on the top seem quite stuck.