Last two
16 ac. HIs journal was outspoken, his diary secret.
I have G?A???C?I
24 ac Shipping manoeuvre reported to 18's colleague in strange metres.
?? / ?T?M
Could it be RE/ STEM
Ask Shakespeare: he invented most of the language. This is from Othello, the locus citatus. I suspect WS was making it up as he went along to fit the iambic pentameters
First Senator:
Ay, so I thought. How many, as you guess?
Messenger:
Of thirty sail: and now they do restem
Their backward course, bearing with frank appearance
Their purposes toward Cyprus.
I think it just means "they turned round", but that's not poetry.