88 
MEASUREMENT OF HIGH TEMPERATURES. 
[BULL. 54. 
If the thermoelement is removed and the lower end of the tube d d 
is prolonged downward by fastening on to it with a piece of rubber 
hose a similar glass tube, t, Fig. 10, closed below, these boiling tubes are 
obviously well adapted for annealing long wires of steel or metal, for 
magnetic or other purposes. Such wires are drawn regularly through 
the hot zone by clock-work; 1 a drum, C. taking the place ot the hour 
hand, from which drum the wires to be annealed are suspended by a very 
fine copper wire, %i\ This method I have frequently used with success. 
Boiling point tubes for pressure work. — When it is desirable to boil 
substances under pressure greater or less than one atmosphere, a form 
d 
7v 
vL 
a> 
Fig. 11. Boiling-point tube for 
pressure work. Scale, J.- 
Fig. 11a. Boiling-tube for pressure 
work, with accessories. Scale, T J 5 . 
Cf. Am. Jour. Sci., 3d series, vol. 32, 1886, p. 279. 
(742) 
