. Economic Papers. rface. • Mixing by Machine: A machine mixer shall be used wherever thevolume of the work will justify the expenses of installing the necessary requirements for the machine will be that a precise andregular proportioning of materials can be controlled and that the pro-duct delivered shall be of the required consistency and thoroughlymixed. Forms: Forms shall be well built, substantial and unyielding, prop-erly braced or wired together, and shall remain true to the lines givenwhen the load comes upon them. Dressed lumber shall be used for allexposed faces and the joi
. Economic Papers. rface. • Mixing by Machine: A machine mixer shall be used wherever thevolume of the work will justify the expenses of installing the necessary requirements for the machine will be that a precise andregular proportioning of materials can be controlled and that the pro-duct delivered shall be of the required consistency and thoroughlymixed. Forms: Forms shall be well built, substantial and unyielding, prop-erly braced or wired together, and shall remain true to the lines givenwhen the load comes upon them. Dressed lumber shall be used for allexposed faces and the joints in the forms shall be such that there willbe no leakage. Beam forms shall be given a slope of not more than oneinch to the foot to insure ease in striking. Where corners and projec-tions occur suitable molding shall be used in the angles of the forms toround or bevel them. All forms shall remain in place until in the opinion of the engineer it-is safe to remove them. Slabs shall remain supported not less than. N. C. Geolc J
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