e in different sizes and lengths depending on the
uses for which they are intended. Heavy protecting outer tubes
may be only 1 in. in inside diameter and as much as 3 in. outside
diameter, while the inner tubes, such as the Marquardt mass and
silica tubes are usually about 3/4 in. outside and 3/8 in. inside
diameter. The length varies from 12 to 48 in. in most cases.

Special terminal heads are provided, with brass binding posts for
electrical connections, and with provisions for water cooling when
necessary.

APPENDIX

TABLE 32.--Temperature Conversion Tables.

TABLE 33.--Comparison Between Degrees Centigrade and Degrees Fahrenheit.

TABLE 34.--Weight of Round, Octagon and Square Carbon Tool Steel
per Foot.

TABLE 35.--Weight of Round Carbon Tool Steel 12 In. in Diameter
and Larger, per Foot.

TABLE 36.--Decimal Equivalents of a foot.

TEMPERATURE CONVERSION TABLES

By ALBERT SAUVEUR

--------------------------------------------------------------------------
-459.4 to 0 | 0 to 100 | 100 to 1000
-----------------|------------------------------|-------------------------
C. F. | C. F. | C. F. | C. F.| C. F.
-----------------|---------------|--------------|-----------|-------------
-273 -459.4 |-17.8 0 32 |10.0 50 122.0| 38 100 212|260 500 932
-268 -450 |-17.2 1 33.8|10.6 51 123.8| 43 110 230|266 510 950
-262 -440 |-16.7 2 35.6|11.1 52 125.6| 49 120 248|271 520 968
-257 -430 |-16.1 3 37.4|11.7 53 127.4| 54 130 266|277 530 986
-251 -420 |-15.6 4 39.2|12.2 54 129.2| 60 140 284|282 540 1004
-246 -410 |-15.0 5 41.0|12.8 55 131.0| 66 150 302|288 550 1022
-240 -400 |-14.4 6 42.8|13.3 56 132.8| 71 160 320|293 560 1040
-234 -390 |-13.9 7 44.6|13.9 57 134.6| 77 170 336|299 570 1058
-229 -380 |-13.3 8 46.4|14.4 58 136.4| 82 180 358|304 580 1076
-223 -370 |-12.8 9 48.2|15.0 59 138.2| 88 190 374|310 590 1094
-218 -360 |-12.2 10 50.0|15.6 60 140.0| 93 200 392|316 600 1112
-212 -350 |-11.7 11 51.8|16.1 61 141.8| 99 210 410|321 610 1130
-207 -340 |-11.1 12 53.6|16.7 62 143.6|100 212 413|327 620 1148
-201 -330 |-10.6 13 55.4|17.2 63 145.4|104 220 428|332 630 1166
-196 -320 |-10.0 14 57.2|17.8 64 147.2|110 230 446|338 640 1184
-190 -310 | -9.44 15 59