Leonardo da Vinci's Multiple Sling

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Leonardo da Vinci's idea was to build a very powerful machine which could throw eight large projectiles at the same time.
He positioned eight long arms around a central pin, each of which had a sling capable of throwing a projectile attached to it.
This kind of project, where weapons were developed to hurl multiple  projectiles to be more powerful, was common in da Vinci's time, because doing this meant creating more powerful weapons, simply by increasing their number and power, without the need to develop new building techniques and using familiar materials. They were therefore potentially attractive weapons because they were powerful,but they were also relatively inexpensive.