To Test Automatic Siphons.
John W. Hill, consulting engineer, Cincinnati, O., writes to FIRE AND WATER: “I have not selected the automatic siphons for the flush tanks of sewers for Marion, O., and the committee from council on sewerage desire, before a siphon is adopted, to have a competitive test of these devices. If you will kindly make the announcement in some way to attract the attention of the makers of the automatic siphons for flush tanks, asking them to address me in the matter, I will, if a sufficient number respond, arrange for tanks, water and other necessary facilities upon the part of the city, and set a date for test. It is probable that the siphon, adopted as a result of this examination, will be used in all the districts as the sewers in these are extended.”
SAWDUST IN MORTAR. — Sawdust seems coming to the front in various ways. A French writer now recommends the use of sawdust in place of hair usually mixed in mortar. He made, it is stated, a composition of two parts sawdust, two parts of lime, five of sand and one of cement, which he alleges is very firm and will not peel off It is also stated that the Technical Royal School at Charlottenburg has been making a series of experiments with sawdust, and has now proved that it can be used as building material. The sawdust is mixed with certain refuse mineral products, and compressed with a pressure of 1,500.000 kilogs. to the quadrameter into the form ofbricks After this treatment, the sawdust forms, it is said, excellent building material, very light, impervious to wet and utterly uninflammable. A slab of this substance was placed for five hours in a coal fire, and came out of the test intact.