This section is from the book "Modern Buildings, Their Planning, Construction And Equipment Vol6", by G. A. T. Middleton. Also available from Amazon: Modern Buildings.
Steps have two sides to the necessary height, about 5 inches wide and 1 to 1 1/4 inch thick, the top and bottom being bevelled so that the steps may stand firmly and evenly at the required angle. The steps, which are grooved into the sides and project slightly therefrom, and have cut corners at ends, are fixed with screws, and are from 5 to 6 inches wide by 1 1/2 inch thick. They increase in length from top to bottom, thus adding to the strength. The distance between the steps varies from 7 to 9 inches. To prevent the legs opening out unnecessarily wide or collapsing they are connected to the sides of the steps by strong cords knotted at each end through eyelets, in which should be fixed rounded steel rings.