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The sign above the infernal little fellow shown above reads, "This is the appratus that controls the volcano. It was made by Henry Legari, and is operated by the gentleman turning the crank. (Sound effect by Bob Hilliard.)" A wide view -- probably around 1950 -- is seen below.
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The volcano was built in 1939 at a cost of $600. The lava rock was hauled in from Pisgah Mountain, near the Knott's old homestead in Newberry Springs. Desert landscaping was added. So were signs, reading, "Danger, keep out!" and "Only active volcano in Southern California. Moved in from the Mojave Desert complete—and has been erupting faithfully ever since." Appropriate noises and steam eminated from the volcano. (The photo below shows the volcano in the 1940s.)
One of the volcano's most peculiar attributes was a strange mechinism of cranks, belts and motors that seemed to be operated by a little articulated devil figure (seen above). Some say the devil was added in the 1950s or 1960s, but historian Phil Brigandi points out an article in the Santa Ana Register from late 1939 that mentions him: "One must stop and read the description of how Mephistopheles does his 'devilish work.' By a little study you can follow the work of the many wheels that 'run' the eruptions. The latest radio amplifying set is used with real sound effects such as one hears in many radio programs... Through all these many turns and twists of the 'devil' the much talked of Inferno turns itself loose on the watching public...."
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In 1952, as the restaurant and surrounding shops continued to expand, the volcano had to be moved. It wound up near Marion and Toni Knott's Sport Shop, not far from the Gold Mine. The new location allowed the volcano to be connected to the Farm's steam plant, which provided an impressive blast of steam with each "eruption."
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The volcano and its diabolical control box were demolished in 1998. I've heard the rumor from numerous people that the devil ended up "going home" with someone who used to work for Knott's. I haven't been able to substantiate this rumor, but the FBI hasn't debunked it yet, either.