Solution to #3: A Time to Remember

    The six plaques refer to six specific events in the University of Toronto's history. Once several are found, this pattern makes the rest easier to determine. From left to right, top to bottom, these events are:

  - The fire at University College, where urban legend says a mason named Reznikoff
    once worked. (February 14, 1890)
  - Trinity College joined the University of Toronto. (1904)
  - The School of Practical Science was (officially) renamed the Faculty of Applied
    Science and Engineering. (June 20, 1906)
  - The collapse of the Quebec Bridge, which partly inspired the iron ring tradition
    amongst engineers. (August 29, 1907)
  - The University of Toronto's Soldiers' Tower was completed. (1924)
  - Rudyard Kipling, author of the Ritual of the Calling of an Engineer, passed
    away. (January 18, 1936)

    The blue scribble is the more cryptic clue. Keen eyes may notice that each letter written in blue is also part of the clock, and together they correspond to the sequence [1, 9, 12, 7]. This is very similar to the date associated with that clock, 1907, suggesting that each date corresponds to the letters on its own clock. This example and the fact that the 10 and 11 places on the clocks are missing also indicate that you should treat 12 as if it were 0.

    By writing out the letters that each date corresponds to, you get the following text:

                        rota te13 pbqr knet ragr hf##

    Rotating by 13 through the clock doesn't make a lot of sense here, but rot13 is a famous cipher, and a subclass of the Tutorial's Caesar Cipher. With each letter rotated 13 letters through the alphabet, the text is then:

                        ebgn gr13 code xarg ente us##

The translated text is the answer: "codex argenteus".

CODEX ARGENTEUS