21.   Time series data can be represented graphically in a line diagram of observations plotted against time as horizontal axis, successive points being joined by straight lines.

22.   Notice that since we have now introduced a flexible price level, it has become necessary to relabel the horizontal axis as real income.

23.   Notice that for convenience the real wage is measured along the horizontal axis and the quantity of labour is measured along the vertical axis.

24.   A ride along the Avenue of Eternal Peace, the horizontal axis of the old city, is anything but peaceful in this new hive of commerce.

25.   All but one of his designs were for so-called horizontal axis machines, which spin like propellers.

26.   The difference in wind speed causes air to spin around a horizontal axis.

27.   The horizontal axis lays out the steps in the procurement value chain, from initial acquisition, through possession and use, all the way to elimination or recycling.

28.   The tub turns on a horizontal axis like the wheel of a car.

29.   Click on any two of these, and rotate them right or left so the horizontal axis becomes longer than the vertical axis.

30.   Monet painted trees, the sky and buildings above an invisible horizontal axis and reflected them in the water below.