Figure 6.

Schematic of furnace core and body.

A. Hermetic insulated posts for electric leads.

B. Inconel flange welded to tube C.

C. Inconel tube furnace core.

D. Brass cover plate.

E. Electric leads (8) to control heaters.

F. Inconel tubes (8, 3.97 mm o.d. × 0.20 mm wall) with thermocouples for temperature control or for monitoring the furnace temperature.

G. Heater for the top core block.

H. Top core block.

I. Copper cylinder for holding the main heater M tightly against the copper blocks H, J, O, and U.

J. End core block.

K. Heater for the end core block.

L. Axially centered copper cylinder for receiving the furnace core.

M. Nickel-chromium alloy wire for suspending and centering copper cylinder L.

N. Main heater.

O. Center core block.

P. Coil for circulating cooling water.

Q. Stainless steel furnace shell.

R. Inconel “spider” for centering the quartz glass cell (type 3 cell) shown in figure 3.

S. Inconel disk welded to tube C.

T. End plate for the center core block.

U. Bottom core block.

V. Heater for the bottom core block.

W. Fused quartz ring for supporting the main heater N.

X. Fiberfrax insulation.