. Journal. rming a barrier to theoutward How ofthe liquid, which at the same time prevents the beatfrom penetrating to the interior, a higher heat to the bottom by a receiver resting on a trolly, and thespent rock subsequently tipped into a small wagonand removed to the furnace by an inclined railway,sufficient carbonaceous matter remaining in the rockto admit of its utilisation in heating the average working temperature is 350 F., and the time taken to treat > charge about four hours. The bitumen obtained working with this form ofretorl is more pure and contains a Less percenta
. Journal. rming a barrier to theoutward How ofthe liquid, which at the same time prevents the beatfrom penetrating to the interior, a higher heat to the bottom by a receiver resting on a trolly, and thespent rock subsequently tipped into a small wagonand removed to the furnace by an inclined railway,sufficient carbonaceous matter remaining in the rockto admit of its utilisation in heating the average working temperature is 350 F., and the time taken to treat > charge about four hours. The bitumen obtained working with this form ofretorl is more pure and contains a Less percentage ofwater than anj Ol her, and the labour in charging andfiring is greatly reduced by the mechanical devicesemployed. Oils. In nearly all cases the companies floated towork this mineral have made the extraction of oiltheir main point, the heavy duty on imported petroleiun, and the great annual consumption of oils forpurposes, proving a gnat attraction in aprospectus. Invariably, or nearly so, these reports. Fig 1a. Fig. 2. effect this causing the formation of a scale, whichrapidly leads to the destruction of the retort. A better designed retort is that of Mons. Boutigny,showTn in Fig. 2, which was awarded a silver medalat the laris Exhibition. The retort is built in anoven, vertically, it- main characteristics being thearrangement for preserving the interior of the retortat a uniform temperature; this is accomplished byhaving an inner vessel, resembling the shell of theretort, but small enough to fit inside, a space beingleft between the outside of the inner vessel and theinside of the outer shell, to permit a circulation ofvapours in the annular space. The inner vessel contains the rock to be treated,and having its sides perforated, allows any vapoursgenerated to pass into the annular space referred to,and circulating between the two walls, tends to pre-vent unequal heating. The bitumen is collected at begin as to the magnitude of the deposit, citing somewell-known geological
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
