The Verge's Version History podcast has looked at the overhead projector. The device was first used mostly for military planning. Then it moved into classrooms and changed how teachers worked.
Before it, teachers wrote on the blackboard with their backs to the class. With an overhead, they could face students and write on clear sheets. That made it harder for students to misbehave.
The episode is the last of a season about school technology, which also covered Oregon Trail and Texas Instruments calculators.
π The Backstory
The overhead projector works by shining a light through a clear sheet and onto a wall or screen. Teachers could prepare sheets in advance and reuse them for years. Schools bought millions of them from the 1960s onward.
Digital projectors, PowerPoint and smart boards slowly replaced them. The podcast asks whether the new tools actually improved on the old machine, or just added cost and complexity.
π― Why It Matters
School technology changes how kids learn and how teachers teach. Looking back shows that newer is not always better.
The Verge's Version History podcast has looked at the overhead projector. The device was first used mostly for military planning. Then it moved into classrooms and changed how teachers worked.
Before it, teachers wrote on the blackboard with their backs to the class. With an overhead, they could face students and write on clear sheets. That made it harder for students to misbehave.
The episode is the last of a season about school technology, which also covered Oregon Trail and Texas Instruments calculators.
The overhead projector works by shining a light through a clear sheet and onto a wall or screen. Teachers could prepare sheets in advance and reuse them for years. Schools bought millions of them from the 1960s onward.
Digital projectors, PowerPoint and smart boards slowly replaced them. The podcast asks whether the new tools actually improved on the old machine, or just added cost and complexity.
School technology changes how kids learn and how teachers teach. Looking back shows that newer is not always better.