# Sharpening Your Mind (DD-317)

> Before sharpeners, pencils were whittled with knives. The French mathematician Bernard Lassimone patented a pencil sharpener in 1828, and many hand-operated designs followed in the 19th century. Rotary sharpeners use gear-driven helical cutters that turn around the pencil, giving a long, even point. The footage shows an old mechanical sharpener being restored and tested.

- Department: Tech (also History)
- First published: 2024-09-04
- Last updated: 2024-09-04
- Permalink: https://detailenjoyer.com/case/sharpening-your-mind/
- Author: Marcus Easterling (DetailEnjoyer), The Detail Department

## On the timeline

- **1828**: Bernard Lassimone patents a pencil sharpener in France

Full timeline: https://detailenjoyer.com/timeline/?case=sharpening-your-mind

## Quick facts

- **DD-317-F01**: Pencils were first sharpened with knives. _(Write-up · Exhibit A (Knives))_
- **DD-317-F02**: Lassimone patented a sharpener in 1828. _(Write-up · Exhibit B (1828))_

## Write-up

The first pencil sharpener was patented in France in 1828. Rotary sharpeners use spinning cutters driven by gears.

1. **Knives**: Pencils were first sharpened with knives.
2. **1828**: Lassimone patented a sharpener in 1828.
3. **19th century**: Many designs followed.
4. **Rotary**: Rotary sharpeners use helical cutters.
5. **Restoration**: The footage is a restoration.

## Related case files

- [No.1 or No.2 (DD-239)](https://detailenjoyer.com/case/no1-or-no2/): I linked more on pencils

## Reel vs. record

- **Note**: None needed.

## Video: Sharpening Your Mind: The First Pencil Sharpener Was Patented in France in 1828

- Duration: 36.2 s · Published: 2024-09-04
- File: https://detailenjoyer.com/assets/videos/C_gb0LVpF32.mp4

### Transcript

Did you know? Mechanical pencil sharpeners have evolved notably over time. Initially, these were simple hand-operated devices made from metal, where users manually twisted the pencil to sharpen it against a blade. The earliest designs, patented in the 19th century, featured a basic mechanism with a fixed blade and a cylindrical barrel to hold the pencil. In the 20th century, sharpeners improved with more refined mechanisms, including adjustable blades and various ergonomic designs. Innovations such as rotary sharpeners introduced a gear-driven system, allowing for more sharpening. Today's manual sharpeners often incorporate advanced materials and precision engineering for enhanced durability and performance. NOW YOU KNOW!

## Questions & answers

**Q: What did people use before sharpeners?**  
A: Whittling. _(Source: Write-up · Exhibit A (Knives) · Wikipedia: Pencil sharpener)_

**Q: Who patented a sharpener in 1828?**  
A: In France. _(Source: Write-up · Exhibit B (1828) · Wikipedia: Pencil sharpener)_

**Q: What do rotary sharpeners use?**  
A: Gear-driven. _(Source: Write-up · Exhibit C (19th century) · Wikipedia: Pencil sharpener)_

**Q: What does a rotary give?**  
A: Precise. _(Source: Write-up · Exhibit D (Rotary) · Wikipedia: Pencil sharpener)_

**Q: What is the footage?**  
A: An old sharpener. _(Source: Write-up · Exhibit E (Restoration) · Wikipedia: Pencil sharpener)_

## Sources

- [Wikipedia: Pencil sharpener](https://en.wikipedia.org/wiki/Pencil_sharpener)

## Cite this case file

Easterling, Marcus. "Sharpening Your Mind." The Detail Department (DetailEnjoyer), case file DD-317, last updated Sep 4, 2024. https://detailenjoyer.com/case/sharpening-your-mind/