176 
MEASUREMENT OF HIGH TEMPERATURES. 
[BULL. 54. 
carries the gas thermometer bulb H G to be soldered to the stem L K. 
The two parallel plates of brass, MM, NN, held at any desirable dis- 
tance apart by three bolts, b a, subserve the purpose of securing the 
bulb G R firmly and symmetrically with respect to the axis of rotation. 
It is easily seen that the two plates 
M M and N N make with the bulb 
G H a joint that is practically of 
the ball-and-socket kind, hence the 
facility of adjustment. A lateral) 
arm, P, clamped to the fixed up- 
right rod Q R, holds the stem K L\ 
in position during the rotation, the 
latter passing through a little ring 
at P. Another lateral arm, TJ TA 
similarly clamped to the rod Q R j 
carries the adjustable lime furnace, j 
i This is a rectangular parallelopi- 1 
2 pedon sawed out of a solid piece of j 
k lime, provided with a large central j 
g perforation passing quite through 
* the block for the reception of the 
| neck and lower stem of the gas- j 
£ thermometer; provided also with a J 
J smaller lateral perforation passing 
I only far enough to communicate ; 
1 with the central hole. This block 
03 
of lime is secured between two par- 
| allel plates of iron by aid of three 
1 bolts, two of which only appear 
in the figure. The plates are, of 
« course, ring-shaped, to correspond 
£ with the vertical perforation of the 
lime block, aud the lower plate is 
riveted to the lateral arm TJ T. To 
obviate confusion of lines the lime 
furnace is omitted in the plan (Fig. 
35). I need only add that the arms 
P and TJ T can be removed afcl 
pleasure; that the bulb, with its] 
lantern-like support, can be with- 
drawn from the spindle by wvM 
clamping the screw W; that, finally, the spindle itself is adjustable ; 
laterally at pleasure, passing, as it does, between two slides, XX and 
¥ Y. These slides are kept in position by two pairs of screws, by which, 
moreover, the slides and the base plate of the spindle may be forced j 
firmly in contact and clamped. 
(830) 
