- Bulletin 423-A
The binder includes several proforma invoices, photographs, and Bulletin 423-A: Operating and Maintenance Instructions, IR4 Infrared Spectrophotometer.
The Beckman Instruments IR spectrophotometers began as a request…
- 1950 – 1969
The labeled illustration depicts the interior of a potentiometer.
Potentiometers regulate the flow of electricity, like the volume dial on a radio. In 1940, Arnold O. Beckman was unsatisfied with dials on the market,…