Edison Reproducer Question

[Chuck]

If we go clear back to about day #1 for
Edison reproducers that are used to play
2-minute brown wax recordings, as far as I now
know, it goes something like this:

First there was the Standard Speaker which could both record and play. It of course is rigid sideways because it can record, and so it
has the tracking issue for playback that was
worked around by the adjuster screw on the old
style machine carriages.

Next there was the Automatic Reproducer.
It has a bit of sideways floating, not a lot,
but enough to obviate the tracking screw adjustment.

Next there was the model B reproducer. (??)

Is this the correct order of things?

What am I missing?

Which one of these has the lightest weight,
and is therefore the easiest on brown wax?

As far as weight, what is the comparison of
model B vs the Automatic?

Thanks!

Chuck