The LeaveMeAloneBox is the worlds most useless machine. It's sole purpose is to turn itself off after you turn it on.
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the lever
The Supermarine Spitfire. No question about that.
There is a few inventions that are not very useful. The most known invention that is not useful is the toilet paper roller.
It has to produce something, otherwise it is an useless machine.
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The Time Machine and The War of the Worlds are H.G. Wells most famous works.
Yes
The Time Machine , The Island of Doctor Moreau , The Invisible Man and The War of the Worlds .
The SINGING KARAOKE MACHINE 900
H.G. Wells's most read book is "The War of the Worlds," a science fiction novel that explores the idea of alien invasion and the resulting chaos and destruction caused on Earth.
X-15
There isn't really a most useless card. If used right they are all powerful.