JOURNAL OF CHEMICAL EDUCATION
132
- JANUARY, 1931 No. of Pirrurrs in Sai
Fertilizers Glass Gas Mantles Paper Petroleum
6 5 4 11 3
Rubber Salt Soap Sugar and Glucose
FILMS AVAILABLE FOR USE IN CHEMISTRY CLASSES I n the December, 1930, number of the JOURNALOF C E E ~ C AEDUCATION L appeared the fourth of a series of articles by theCommittee on Visual Aids in Chemical Education of the Division of Chemical Education of the A. C. S. (pp. 291C27). In the headings of the list of films (see page 2919) the following abbreviations were used: Saf., Inf., 16, 35. The "Saf." and "Inf." refer to safety film and idanunable film, respectively. The "16" and "35" refer to mm. width of film. Users of the 16-mm. motion picture films will find a very useful book in the "Directory of Film Sources," which gives a complete list of places to "buy, rent, or borrow 16-mm. films." This booklet will be furnished free by the Victor Animatograph Corporation, Davenport, Iowa.
English Ride on Rubber Bricks I n some parts of Great Britain the streets are now paved with rubber bricks. In a report to the recent Sixth International Road Congress a t Washmgton, a British delegation told of the success that rubber paving has had in London. Newcnstle, Edinburgh, and Glasgow. The first experiments to substitute rubber for brick and asphalt were made in 1913, it is stated. A rubber pavement in Glssgow, consisting of blocks of rubber 9 X 4'1%X 11,'. inches, was laid on a concrete base in 1923. "Traffic in Glasgow is some of the heaviest and most trying class," the report states. "The cap of one block came away from its tread in 1925,this is the only defect reported. The paving is in good condition and sbows no apparent wear after six years' use." An installation in London was in New Bridge Street, which bears some of the city's heaviest traffic, with 17,623vehicles, or 51,100 tons between 8 a.m. and 8 P.M., in addition to considerable night traffic. This was laid in 1926. "After two years of wear, 416 blocks, or say four per cent were renewed, and now a t the end of the third year approrimately another ten per cent have to be renewed," the report states. "The defects are in the nature of blisters and the subsequent peeling off of thin layers of the cap where blisters appeared. The layers stripped off in no case extend the full surface of a block and are about one-Wth of an inch thick; the defects cause no inwnvenience to traffic, but they wllect dirt and are a blemish." The paving costs about $22.00 a square yard, laid without foundation, i t is stated.Scimu Service
