. The Locomotive . ed with bar iron. Theregular reinforcing steel is, of course, quite acceptable for this purposealthough a few lengths of railroad iron laid at right angles to eachother is an excellent reinforcement in a construction such as this. Therails should be cleaned of oil and grease before using. There have been installations in which the foundations of thewalls of the buildings have been placed on bed rock and vibration hasdeveloped in the building when the machinery also had its founda-tions resting on this rock. In such cases, when the rock lies so nearthe surface that it is diff
. The Locomotive . ed with bar iron. Theregular reinforcing steel is, of course, quite acceptable for this purposealthough a few lengths of railroad iron laid at right angles to eachother is an excellent reinforcement in a construction such as this. Therails should be cleaned of oil and grease before using. There have been installations in which the foundations of thewalls of the buildings have been placed on bed rock and vibration hasdeveloped in the building when the machinery also had its founda-tions resting on this rock. In such cases, when the rock lies so nearthe surface that it is difficult to avoid placing the machinery founda-tions upon it, it is well to blast an opening in the rock so that a sandcushion may be placed between the engine foundation and the rockas illustrated in Fig. 2. A box or retaining wall of concrete as shownin Fig. 3, may also be used to accomplish this purpose. The neces-sary spread or area of foundation is, of course, based on the allow-able bearing pressure on the :? 4.^:<
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