Library›Inventions & Discoveries›One card

A LITTLE SOMETHING WORTH KNOWING

A small discovery. Yours to pass on.

HistoryOne small ahaInvention or discovery

He demonstrated a safety brake for passenger elevators in 1854.

Think it. Then flip it. ahamoraTap to reveal Back to the cue
HistoryOne small aha
Your new ahaElisha Otis

Otis is associated with a safety mechanism that helped stop an elevator if its lifting cable failed. Source: Elisha Otis ↗

ahamoraReference ↗

Keep the thread going

One answer is a beginning.

Share a little curiosity, or follow it into the full collection.

Flip the full deck →

More from Inventions & Discoveries

A few more worth knowing.

  1. 33This Hungarian-Argentine inventor developed a successful pen with a rolling ball tip.RECALL
    László Bíró

    Patented an improved design in 1938

    Open this card ↗
  2. 34Astrolabe · the celestial information it helped users estimateRECALL
    The position of celestial bodies.

    It was used in astronomy, navigation, and timekeeping in several cultures.

    Open this card ↗
  3. 35Mariner's compass · its navigational purposeRECALL
    Finding direction.

    Magnetic compasses made it easier to navigate when landmarks or stars were not visible.

    Open this card ↗