Lord Kelvin

“I have not the smallest molecule of faith in aerial navigation other than ballooning.”
” ‘Vector’ is a useless survival, or offshoot from quaternions, and has never been of the slightest use to any creature.”
“X-rays will prove to be a hoax.”
“Radio has no future.”
“Wireless [telegraphy] is all very well but I’d rather send a message by a boy on a pony!”

William Thomson, a.k.a. Lord Kelvin, a visionary.