. The Locomotive . Bed RocK., Fig. 2. When the soil will permit it, the excavation itself may providethe form for pouring the concrete. If the ground is not firm enoughfor this, wooden forms must be built. Battered or sloping slides maybe used when it is desired that the foundation have additional spreador bearing area. It is more convenient, however, and it is just assatisfactory to use vertical sides and secure additional bearing surface I92I.] THE LOCOMOTIVE. 167 Floor. ;.y/;. ;K:. f?ctainingWell.

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