That type of cup had a piercing device in the bottom, and drivers carried rubber capsules about an inch long filled with ether. Push one into the cup and snap the lid down, and a measured dose of starting fluid was released. We called 'em "horse pills".

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Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!