Bram Stoker seems to have been obsessed with the latest technologies. If he were alive now, he'd be that guy who makes sure he's first in line to get the newest iPod. He makes a big point of having his characters use really up-to-date (for 1897) gadgets for communication – Jack Seward, for example, records his diary on a phonograph, which is an early recording device. All the high-tech gadgets contrast strongly with the superstitions and ancient traditions surrounding Dracula himself.
If Dracula represents the distant past, his invasion of Great Britain could be read as an allegory for the way that history can come back to haunt the present.
The technology in Dracula gives the Crew of Light an advantage over Dracula, yet those technologies fail at crucial moments: in the end, it's only through the use of relatively primitive weapons and rituals based in superstition that the men are able to defeat the vampire.