Type is set in a composing stick. Longer lines need a longer composing stick. We have several sizes.
Leads are the thin pieces of metal that go between the lines (where we get the term "leading"). Slugs are 3x thicker and are always used top and bottom, but can be used between lines as well.
Type is set from right to left, but in the correct order.
This is Univers 55.
Recently, I've begun sorting through the abandoned galleys again. I first picked out all the spacing material and lined it up. We can use that right away.
Then I started sorting the type by typeface. I rather like how this looked as I sorted. I haven't verified it, but I think the two typefacess are either Avant Garde or Futura (larger) and Phenix (thinner). The rest of the tray had 14 point Univers 75 and an as-yet-unidentified serif face, possibly Garamond.
Good thing Mr. Little made us memorize the job case in junior high Graphic Arts class.