The length of a tread is 18 inches. In this ladder the sides are vertical. To mark out a side piece, draw on the floor a centre line and two parallel lines across and at right angles to it, 24 inches apart. Make a mark on one line inches from the centre line, and another … Read more
Rain-water is fit for human consumption only after boiling or filtering through a filter fine enough to stop the tiny bacteria which may swarm in it. Even after treatment it may be unsafe if it has been stored in lead-lined tanks or passed through lead pipes, as it is able to dissolve lead. Rain-water should … Read more