The magnetometric method was employed, and the metals, in the form of ovoids, were heated by a specially designed burner, fed with gas and air under pressure, which directed 90 fine jets of flame upon the asbestos covering the ovoid.
The furnaces are driven to a white heat in order to fuse the mixture and expel bubbles of gas and air.
Io, the gas and air in one phase enter at the bottom of all three of the large vertical chambers, burn in passing up wards, and escape at once at the top, as shown by the broken m arrows.
When " on gas," the gas and air enter at the bottom of each of the three larger vertical chambers, pass once up through the stove, and escape at the top, as shown by means of broken arrows.
Darlene had to go before much longer so Sue rang for a backup to swop over and bring more gas and air.