American chemical journal . ut through the neck of the funnel, whence rubbertubing takes it to the burner F, The apparatus is set up and worked as follows : The glass bulbA (Fig. I) is placed in the air-bath G, and the smaller piece oftubing VI is pushed into the end of the U tube B, where it iscemented by means of plumbers cement. The gas is let into theapparatus, the Argand burner is lighted, the screw-top a is opened;the nut-working rod is screwed up until the mercurial cup orrubber stopper is near enough to the orifice of the T tube deliver-ing the gas to cause the flame to fall when the d
American chemical journal . ut through the neck of the funnel, whence rubbertubing takes it to the burner F, The apparatus is set up and worked as follows : The glass bulbA (Fig. I) is placed in the air-bath G, and the smaller piece oftubing VI is pushed into the end of the U tube B, where it iscemented by means of plumbers cement. The gas is let into theapparatus, the Argand burner is lighted, the screw-top a is opened;the nut-working rod is screwed up until the mercurial cup orrubber stopper is near enough to the orifice of the T tube deliver-ing the gas to cause the flame to fall when the diaphragm isslightly depressed. One wire of the battery is connected with thescrew-cup e, the other being placed in connection with screw-cup piece of copper wire connects o and c, n and o being the endsof the electro-magnet wire. When the proper temperature isreached, as indicated by the thermometer in the air-bath, thescrew-top a is screwed down tight. The residual air in A con- A conveyiieni Temperature Regulator. 289. 290 Mackintosh. tinuing to expand, pushes the mercury in the U tube until it comesin contact with the platinum wire f. At this instant the electriccircuit is completed, the electro-magnet attracts the armature, thediaphragm h is depressed, the flow of gas is almost entirely cutoff, the flame of the burner falls, the temperature sinks, the air inthe bulb contracts, the mercurial column breaks contact withy, thespring attached to the armature draws the diaphragm back to itsoriginal position, the free flow of gas again takes place, and theapparatus is again in its former condition, the alternations of coursetaking place as often as contact is made and broken by the mer-curial column and f. I find plumbers cement to be well adapted for cementing thescrew tops to the U tube. The diaphragm covering the mouth of the funnel may be madeof rubber or other flexible gas-tight material. The mercury used in the U tube should be perfectly clean. The apparatus made as abov
Size: 1330px × 1880px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, bookpublisherbalti, bookyear1879
