For lights more than five feet square plate glass must be used. This may be obtained in three grades, French plate and two gradas of American plate. French plate, and the first or silvering quality of American plate, are used almost entirely for mirrors, while the second quality of American plate is used for glazing.

American glazing plate is made in one quality only, and is usually one-quarter inch thick for ordinary sizes, but is necessarily thicker for large lights, and may be obtained in sheets as large as twelve by seventeen feet. Plate glass is absolutely straight, being cast on a perfectly flat cast iron table and rolled to the required thickness. The rough plate thus formed is carefully examined for flaws which are cut out, leaving as large a sheet as possible which is polished. French plate may be distinguished from American plate by the color, when looked at endways. The French glass shows perfectly clear and white, while the American glass has a bluish color.

Crystal Plate

A kind of plate glass called crystal plate is made, about three-sixteenths of an inch in thickness. This is used for railway cars and in places where thin sashes must be used or a saving in weight is desirable.

Final Inspection

With the departure of the painter the house is usually complete, and ready for the architect's final inspection and acceptance. This inspection should be careful and thorough from top to bottom, and no certificate of acceptance should be issued, until the architect is satisfied that everything has been done which is actually called for or reasonably implied by the plans and specifications.

HOUSE AT CLEVELAND, OHIO Watterson & Schneider, Architects, Cleveland, Ohio. Plans of this House are shown on Page 106. Drawing made specially