Portland cement concretes and other Portland cement products are known to be vulnerable to pure or soft waters. This problem is of practical importance in pipe lines or thin concrete sections where large volumes of such waters flow over concrete and other Portland cement products for long periods. The severity of attack is largely dependent on the quality of the concrete : poor concrete, even in thick sections, can be seriously attacked under very severe conditions.
The previous two articles in this series have considered generally the duties of a manager and discussed delegation in management. In this third article Mr. Jackson, who is a Director and General Works Manager of the Appleby-Frodingham Steel Co., writes about recruitment, training and other facets of human relations. He states that he believes that successful managing depends on a few principles. This article is concerned with some of these and with difficulties that arise in practice, the sections on training and redundancy being especially significant.
Results of observations on the heaving of thirty-seven houses founded on expansive soils are presented. The types of construction used include one house of orthodox construction on normal strip footings, twenty-four houses on under-reamed pile foundations with different depths of founding, and twelve houses constructed of reinforced brick-work. The maximum, average and differential movements of the houses and some data on the swelling of the soil at various depths are given.