MAY CONTAIN NUTS
SHORPY
HOME
 
JUMP TO PAGE   100  >  200  >  300  >  400  >  500  >  600
VINTAGRAPH • WPA • WWII • UP N' ATOM: c. 1950s

Ready Player One: 1940

Ready Player One: 1940

November 1940. Ansonia, Connecticut. "Taking a temperature reading in the foundry at the Farrell-Birmingham Corporation." Medium format acetate negative by Jack Delano for the Farm Security Administration. View full size.

 

On Shorpy:
Today’s Top 5

Red is Red and Yellow is Yellow

'Red hot' can be defined by what color red. It doesn't matter if it is a piece of steel, or the end of a cigar. Planck's Law goes into it far greater detail than I would want to:

https://en.wikipedia.org/wiki/Planck%27s_law

Optical Pyrometer

Today we have infrared, non-contact temperature sensing devices. Back then you used an optical pyrometer where a calibrated filament glowed at a specified temperature on the rheostat setting.

The color was matched visually and then the scale was read off the dial setting. Here is one in use at a wire drawing facility where I worked.

Syndicate content  Shorpy.com is a vintage photography site featuring thousands of high-definition images from the 1850s to 1950s. The site is named after Shorpy Higginbotham, a teenage coal miner who lived 100 years ago. Contact us | Privacy policy | Site © 2019 Shorpy Inc.