I'm not sure how many eligible men you'd find in the engineering department...
Signed,
An engineer married to a teacher.
In all seriousness though... at least ask him for coffee. It'll accomplish two things - you'll get to know him better, answering the questions from post #22, and you'll be able to approach the whole idea of seeing each other more directly. (another reason to take 33 1/3's advice of avoiding a "research" pretext). Men are dense (trust me, I am one). As you've noticed, hints will not work, especially for someone who is shy (and may be less inclined to seek the answer to what may be a misread signal).