Join William Lidwell for an in-depth discussion in this video Factors of safety, part of Universal Principles of Design.
- [Voiceover] Hi, I'm William Lidwell,…and this is the Universal Principles of Design.…In this movie,…factors of safety.…Or how to design for unknown unknowns.…On the night of May 22, 1903…students and staff of the Pennsylvania…electro-mechanical institute…in Pittsburgh,…prepared the Donnelly building…for thefir annual banquet and ball.…Festivities are to be held on the…fifth and sixth floors,…dancing on five,…and dining on six.…
More than 700 people will attend.…The building elevator is expected to get a workout.…So, two days prior the elevator engineer…performs maintenance to make sure it's up for the event.…He tightens a few bolts and fixes up the brakes.…Everything appears to be in working order.…Elevators in those days,…worked pretty much like they do today.…You have cable pulley system.…With a passenger car on one side,…and counterweights on the other.…The counterweights keep the loads in near equilibrium,…minimizing the work the motors need to do…to move a car up and down.…
Around 10 PM that evening,…anxious to join the party on the sixth floor,…
William Lidwell
Jill Butler
Updated
6/7/2017Released
7/15/2015Skill Level Appropriate for all
Duration
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Video: Factors of safety