Chemical engineering . e at t. Wlion llu- loiiipi-ialurc inthe muffle was loo high for the tborniometer a carbon nul willia little cup-shaped liollow bored out at one cnil was put porcelain tube and in the hollow a small piece of metal wa>placed, so that the time of its fusion could be observed, riio AX7riurili>re llu- proper thickness for the upper rc^i^tor would be 32 = cms. another complication e.\ists, (or hitherto we have tacitlyassumed that the resistivities of both resistors would be thesame. This, however, will not be the case, for the resistivityof the low
Chemical engineering . e at t. Wlion llu- loiiipi-ialurc inthe muffle was loo high for the tborniometer a carbon nul willia little cup-shaped liollow bored out at one cnil was put porcelain tube and in the hollow a small piece of metal wa>placed, so that the time of its fusion could be observed, riio AX7riurili>re llu- proper thickness for the upper rc^i^tor would be 32 = cms. another complication e.\ists, (or hitherto we have tacitlyassumed that the resistivities of both resistors would be thesame. This, however, will not be the case, for the resistivityof the lower resistor will be less than that of the upper re-sistor, because of the greater pressure on the fomier by tbcmuffles and their contents. This effect cannot be calculated,so it seemed best to leave the determination of the size forthe upper resistor to experiment. Alterations in the upper re-sistor could easily be made by removing the top of the fur-nace. In Fiij .? i-. shown a eeniTal view of the .vmuffle fur-. KIG. J.— VIEW OF FLRN.\CE. The three bricks projecting from the side wall of thefurnace indicate the position of the muffles, as these could beremoved so that the interior of the muffles might be iM^ttom of this furnace was only 7 cms. thick, and it wasobserved that after a run of a few hours the loss of heatthrough the bottom was very great, hence, a considerablygreater thickness was used in building the furnace. Thefirst stage in the construction of the furnace now under con-sideration is shown in Fig. 4. The lower resistor is in place,and the five muffles, the openings into the latter being scoop is lying on the top of the muffles. In Fig. 5 isshown the same side of the furnace as in Fig. 4 after thebuilding was finished. In Fig. 6 the other side of the furnaceis shown with the rod b projecting and connected with thevoltmeter. At the left side is shown the regulating resistorwith bricks laid on the granular carb
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmetallu, bookyear1902
