Temperature tests of a fire by observation can be told in a fairly exact manner by Table XLVII.

Table XLVII - Temperature Of Fires

Appearance of Fire

Approximate Temperature, Fahr.

Red, just visible................

About 977 degrees

Red, dull.......................

About 1290 degrees

Dull red, cherry...............

About 1470 degrees

Red, full cherry.................

About 1650 degrees

Red, bright

About 1830 degrees

Orange, dull.....................

About 2010 degrees

Orange, bright..................

About 2190 degrees

White heat..... ................

About 2370 degrees

White, welding..................

About 2550 degrees

White, dazzling..................

About 2730 degrees