|Reginald Fessenden electromagnetism|
Hot wire barretter
- For receiving AM radio signals,
- Reginald Fessenden ran a current
- across a thin platinum wire
- heating it almost to the point
- where it lost its ability to conduct.
- Adding an AM signal to the current
- increased the temperature when the amplitude rose
- stopping the flow of electricity
- and decreased the temperature when the amplitude fell
- letting the electricity flow.
- The barretter acted as a rectifier
- for an oscillating AM signal.
- The amplifier had not been invented,
- so listeners were wired to earphones.
Effects of heat
- Heat me sufficiently and I’ll stop trying;
- sleepiness overtakes me till thinking stops.
- It’s useful to know one’s limits; biology
- opens sweat glands and regulates the heart.
- Add ice to the lemonaide; pour me a beer;
- there’s a lot I still want to figure out.