Men in a bathysphere at sea-bed may transmit.

From a post on gmtplus9 about cigarette cards to the amazing NYPL Digital Gallery and the Age of Power and Wonder Gallery:

Our future servants?
(published ca. 1935-1938)

Aerodrome of the future.
(published ca. 1935-1938)

Captain Eyston's car 'Thunderbolt'.
(published ca. 1935-1938)

Verso:

It weighs SEVEN TONS!

And my favorite:

Television of the future.
(published ca. 1935-1938)

Verso:

What inspired copy-writer came up with this future-conjuring sentence:

Men in a bathysphere at sea-bed may transmit to the home set or to the cinema scenes taking place at the bottom of the ocean.

Somewhere the skull of Hugo Gernsback is smiling. And then one thing lead to another and the Gallery of Frank R. Paul's Artwork

The Future of Radio. Illustration by Frank R. Paul,
in Radio For All, Hugo Gernsback, 1922

Doctor Hackensaw's Secrets. Illustration by Frank R. Paul,
No. 12: The Secret of the Philosopher's Stone,
Science and Invention, Jan. 1923

And of course, from William Gibson's classic short story, The Gernsback Continuum:

Then I looked behind me and saw the city. The books on Thirties design were in the trunk; one of them contained sketches of an idealized city that drew on Metropolis and Things to Come, but squared everything, soaring up through an architect's perfect clouds to zeppelin docks and mad neon spires. That city was a scale model of the one that rose behind me. Spire stood on spire in gleaming ziggurat steps that climbed to a central golden temple tower ringed with the crazy radiator flanges of the Mongo gas stations. You could hide the Empire State Building in the smallest of those towers. Roads of crystal soared between the spires, crossed and recrossed by smooth silver shapes like beads of running mercury. The air was thick with ships: giant wing-liners, little darting silver things (sometimes one of the quicksilver shapes from the sky bridges rose gracefully into the air and flew up to join the dance), mile-long blimps, hovering dragonfly things that were gyrocopters...

Image of the Modern City
from the set of the 1930 musical, Just Imagine.
From INVENTING MODERN:
AND CREATING AN UNEXPECTED FUTURE

Image from a 1928 issue of Amazing Stories.
From INVENTING MODERN:
AND CREATING AN UNEXPECTED FUTURE