. Engineering and Contracting . can easilybe converted to any tonnage or any price coal. For ,if a plant burns 10,000 tons a year and pays %^ a ton, its scaleis a hard carbonate 1/16 in. thick. By referring to the chart,we find the dollar and cent loss per 1,000 tons, $3 coal, is$.S78; $4 coal is 1/a more, hence, 1,000 tons of $4 coal means$504 lost, and 10,000 tons $5,040 lost. Again, in a plant having a hard carbonate scale, 1/32 burning 10,000 tons a year, $4 coal, the loss is $3, is a sum justifying (on a 16 per cent gross basis) anexpenditure of $21,250 to overco
. Engineering and Contracting . can easilybe converted to any tonnage or any price coal. For ,if a plant burns 10,000 tons a year and pays %^ a ton, its scaleis a hard carbonate 1/16 in. thick. By referring to the chart,we find the dollar and cent loss per 1,000 tons, $3 coal, is$.S78; $4 coal is 1/a more, hence, 1,000 tons of $4 coal means$504 lost, and 10,000 tons $5,040 lost. Again, in a plant having a hard carbonate scale, 1/32 burning 10,000 tons a year, $4 coal, the loss is $3, is a sum justifying (on a 16 per cent gross basis) anexpenditure of $21,250 to overcome or prevent this loss. We all know that the scale thickness varies in any typeof boiler. In the fire tube type there is more scale at therear than at the front end; that the scale will be thicker onthe tubes than on the shell: in the water tube type of boilerthere will be more scale in the middle and bottom rows ottubes than in the top rows. To make the chart most valuable,the average thickness should be closely Mosquito Extermination in New Jersey Would Increase Tax-able Values $500,000,000.—The absolute extermination of thesalt marsh mosquito in New Jersey is practicable and opensthe way for an increase of more than $500,000,000 in taxablevalues of the state to be achieved within a period of 20 years,according to a report of Dr. Thomas J. Headlee, state ento-mologist of New Jersey, submitted Feb. 5 to the New JerseyMosquito Extermination Associations Convention. The reportfixes the probable cost of draining the 260,000 acres of saltmarsh at $900,000, instead of $750,000, as formerly shows an increase in valuation of the Newark meadow from$650 in 1896 to $238,513 in 1919 in consequences of mosquitoextermination, making large areas of marsh available forfactory sites and other commercial purposes. (75) 274 Engineering and Contracting for March 10,1920. Compounds for Treating BoilerWater* By W. S. MAHUE. Boiler compounds are of many different comp
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