FFour in one flash cubes for Kodak Instamatic Cameras. They were...

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Four in one flash cubes for Kodak Instamatic Cameras.

They were also good for sabotaging people. You wire them up to fire all four at once, and usually half a dozen of 'em. Use a car coil as an ignition source.

I once picked the lock on the Honeymoon suite, and so wired it up. I arranged a switch under the bed, so when my mate nd his lady started bouncing around with gusto, they would trip the switch, and set the flash cubes off. You can also set up a time delay, so they will go off sequentially.

Marum....The mad engineer.