This differs from the one just described chiefly in that it is single-acting, while the other is double-acting.

If the feed pump be double acting, or the engine single acting, the capacity of the pump must just be one half of what is given by this rule.

The western chamber was originally in two stages, the lower acting as a porch to the church, the upper as a chapel with an altar under the Saxon rood.

Mortlake, too, had received a notice that his machines were eligible for a test, so that there would have seemed to be no object for his acting treacherously.