s. The dust from the coke solvents, using petroleum preferably either alone or cently invented excavator, which is of the sectional is bought by the Russian and German governments and with benzine added to it. After treating for a certain bucket type. The excavator has a very simple con-… … This paper may be considered an authoritative exposi- coke, 13,333 pounds of tar water, 1,333 pounds of tar, AN IMPROVED EXCAVATOR. tion of a most important subject. The first installment and 6,999 pounds of gas (110,833 cubic feet). of the paper appears in the current Supplement. Mr. struction,…
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