Contractors' and Dealers' Association of California · San Francisco : L. A. Larson · leaf 273
or three timesduring each shift, or from six to ninetimes a day, to keep the mix constant.Each yard of concrete crmtains 25 cu.ft. of gravel or stone and 5 or 6 sacksof cement, the amount of cement de-pending upon where the concrete is tobe used. This leaves only the sand sub-ject to variation, as… … •ReprintContracting, fr EngineChicago. ■ring uses two 4-yd. mixers. These mixerswhich are in turn handled by 10 toncranes. Placing forms, concrete, etc.,requires the steady use of 10 full circle10-ton cranes. Additional mobile equip-ment consists of 12 locomotive cranes,26 standard gauge…
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