Kineskope frame rate

[DVtyro]

What frame rate did they use for kineskope? Wikipedia says, it was 24 fps with the shutter modified to better match 30i, if this is true I wonder why did not they use 30 fps. Just to save film? To make it compatible with projectors? I suppose in Europe they used 25 fps?

I suppose, running film at 60 fps was too expensive? Was it even technically feasible to map each field into a film frame back then?