According to R.H. :
This week's set has just been posted:

http://puzzlephotos.blogspot.com/

As usual -- posting from rec.crafts.metalworking.

793) Perhaps for cutting or scoring a groove in the edge of
something wooden?

A closer look at both ends of the blade clamped in it might help
somewhat.

794) A *very* old office dictation machine. It looks as though it
uses something like Edison cylinders.

795) This looks as though its function is to slide in a square tubing,
and then to be locked at a certain extension. Perhaps it is to
be an extendible leg on some furniture?

796) A "modular phone plug" model RJ-11. (RJ-13 is the six-conductor
one, and RJ-45 is the eight conductor one, which is used for
twisted pair ethernet among other things.

A somewhat narrower version is used for handset cords for phones
of a certain age.

797) It looks as though it is intended to pull chain links together,
perhaps to allow a "repair" link to be installed. And, at a
guess, the two notches in the faces of the flat jaws are to
close an opened link once it is in place.

798) The end of the pocket knife looks as though it is is intended
to smooth a surface by rocking back and forth in contact with
it.

Perhaps for burnishing paper which has been erased by scraping
off the ink? In that case, the blades might be to cut a new
point in a quill pen?

Now to see what others have said.

When can you safely go back to the Roman numerals? They make
this thread easier to find -- but obviously you don't want them
classified as porn spam, which I believe was the reason to abandon
temporarily the Roman numerals in the first place.

Enjoy,
DoN.

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