The Mechanical Handling and Storing of Material

BLAST-FURNACE HOISTS 351 height of the burden of the furnace for the purpose of preventing under or over charging, four rods are let into the top of the furnace through suitable openings, and the rods are connected with dials situated in the hoist operating house, so that as the rods are lowered into the furnace they indicate the exact height of the stock. Another indicator fixed up in the cabin consists of a graded dial connected to the bell by a light wire rope. Its gearing is such that a drop of 1 in. of the bell corresponds to a 3-in. pointer deviation on the dial. There is also an automatic indicator for Fig. 492. Lürmann Furnace Hoist. signalling the number of buckets from each charge, the latter being indicated by the hoisting drum. The dials of all the indicators are prominently placed in the operating house so as to be well within the view of the hoist attendant. Lürmann Furnace Hoist-—Another modification of the inclined furnace hoist has been designed by Lürmann, of Osnabrück. In his opinion, it is a defect in the older types that, as the car is tippsd, ths coarser material is shot at one side of the hopper, while the finer material will lie in a heap on the other side. Moreover, the throw has the effect of breaking the coke, and thereby wasting it. Reference has already been made to the remedies for this defect. But over and beyond this objection