Figure 3.

Aluminum-point cell with fused quartz casing (Type 3 cell).

A. Connection to high vacuum, purified argon gas source, and manometer (see fig. 5).

B. Fused quartz-to-Kovar graded seal.

C. Insulation, fused quartz wool.

D. Fused quartz thermometer well (precision bore 7.94 mm i.d. and continuous with the outer fused quartz envelope), outer surface matte finished to minimize radiation piping.

E. Heat shunts, graphite disks.

F. Graphite lid.

G. Graphite thermometer well.

H. Graphite crucible.

I. Fused quartz fiber, woven tape for cushioning.

J. Aluminum sample.

K. Fused quartz fiber pad for cushioning the thermometer.