The Driven Well Supply for Dayton, Ohio.
We present to the readers of FIRE AND WATER a sketch of the source of the water supply for the city of Dayton. The following is an extract from the report of the trustees of the water-works :
THE WATER SUPPLY AND NEW WELLS.
The water supply was equal to all demands and no extra restrictions whatever were placed on its use for any purpose. The unusual demand for water and the extraordinary number of consumers the past year has made it necessary to make provision for the future; and this board deemed it advisable to lay an additional 30-inch suction pipe, which will extend about 2500 feet up Mad river to a point where the present 25 flowing wells are located and to which will be attached about 25 additional 8-inch tube wells. The material for this improvement has been contracted for and nearly all of it delivered, as has also the contract for putting down the wells been let and the work on the latter commenced.
The wells that have been finished prove to be as strong in their flow as any heretofore put down. The flow from the 40 wells now in use continues as strong as when we first began pumping from them, and as an evidence of this, the amount of water pumped in 1891, was 1,137,190,080 gallons, and in 1888, the first full year’s pumping from the new system, was 725,. 620,700 gallons, an increase in the [amount of water pumped in the past f*ur years of 411,569,380 gallons.
Following is an analysis of the water of the new wells. We presume it is substantially the same as the anal) sis of the water of the old wells. It would be interesting to know the relative difference of the waters of Mad river and those of the driven wells.
It would be also of considerable value to water-works literature to know what is the average depth of the water in each of the wells after a pumping of twenty-four houis. The report states that the flow in the new wells proves to be as strong as any heretofore put down :
Showing the amount of the bases and acids present in the water, results expressed in grains per U. S. gallons:
How SOME FIRES MAY BE ACCOUNTED for.—When oxide of iron is placed in contact with timber excluded from the atmosphere, and aided by a slightly increased temperature, ‘.lie oxide will part with its oxygen, and is converted into very finely divided particles of metallic iron, having such an affinity
for oxygen that, when afterward exposed to the action of the atmosphere from any cause, oxygen is so rapidly absorbed that these particles become suddenly red-hot, and if in sufficient quantity will produce a temperature far beyond the ignition point of dry timber. Whenever iron pipes are employed for the circulation of any heated medium, whether hot water, hot air or steam, and the pipes allowed to become rusty, in close contact with timber, it is only necessary to suppose that under these circumstances the particles of metallic iron become exp sed to the action of the atmosphere, and this may occur from the mere expansion or contraction of the pipes, in order to account for many of the fires which periodically take place at the commencement of the winter season.