From Spellbound, 1976.  (Courtesy of Archive.org.)

Phantoms emerging from a film projection (as they're wont to do).  From Amazing Stories, 1943.

Are any ghosts watching?  We roll in the Spirit Applause-O-Meter to find out.  It's Prof. Oddfellow's Penetralia.  Thanks to KlingonCaptain who wrote, "I just realized that a lot of sitcoms from the days of analogue film probably have a lot of ghost cast members but we just can't see them. Can you imagine what The Andy Griffith Show, Dick Van Dyke Show, and The Flying Nun would be like if we could see the spirit cast members?! If only the Sylph Scope was real and we could use it to see ghosts."

"I will call it Comsognathus Obtusidens Blinksis."

Ghost of the Victim: "Well!  That's rough on me."

From Life, 1900

From Salem's 1977 yearbook. 

From Cine-Mundial, 1920.

"Holidays are fun."  From Story Carnival by DeLancey and Iverson.

"The way is easily lost.  There's a ghost in every room."  From North Central's 1977 yearbook.

A library ghost (confirmed by our custom Uncanny Detector app), from Pfeiffer's 1974 yearbook.

"A life-sized apparition built up from the ectoplasm emanating from the medium 'Eva.'  One of 201 photographs taken by Mme. Bisson and Dr. Notzing, 1909-12."  From Hearst's International, 1921.

A constellation of orbs hovers among the dancers.  From Queens College's 1957 yearbook.

How a theatrical ghost walks.  (But no mention of how ectoplasmic perambulation occurs.)  From Spook Crooks by Julien J. Proskauer, 1932.

"Maybe if I run fast nothing will catch me. ... I'm went so fast that I turned into a ghost!!!"  From Monsters News, 2012.

A spirit photograph from Encyclopedia of the Unexplained by Richard Cavendish, 1974.