From Astounding, 1936.

From Beyond the Tomorrow Mountains by Sylvia Louise Engdahl. 

From The Martlet, 1965.

From Games Workshop Catalogue, 1983.

From How to Live Safely in a Science Fictional Universe by Charles Yu.

From Three From the Legion by Jack Williamson.

"'It talks!' he shrieked.  'I'm mad--mad--!'"  From Astounding Science Fiction, 1938. 

"The shot into infinity."  From Science Wonder Quarterly, 1929.

Martian technology for seeing one's internal organs.  From Amazing Stories, 1928.

From Amazing Stories, 1931.

This is more interesting that Tron's light cycles, in that they're based upon mundane motorcycles.  From Amazing Stories, 1931.

"A cosmic necklace across the throat of space, twenty flaming suns hung across the sky."  From Astounding Science Fiction, 1938. 

From Fantastic Science Fiction and Fantasy Stories, 1972 (courtesy of Archive.org; our restoration, as per usual).

From Astounding Science Fiction, 1938.

One of many tools we use to create our posts and tap into our latent reptilian part of our brain.  From Astounding, 1944.

From Astounding Stories, 1938.

From Planet Stories, Fall 1943.

"The hidden world."  From Science Wonder Quarterly, 1929.

From Science Wonder Quarterly, 1929.