extra charge for same being made by the Contractor unless, in the opinion of the Engineer, the Contractor be really entitled to extra compensation on account of such changes.

The Contractor shall furnish without charge as many sets of shop drawings as the Engineer and other officers of the company may deem necessary for their use during construction or for record.

INSPECTION.

The inspection and tests of metal will be made promptly on its being rolled or cast, and the quality will be determined before it leaves the rolling-mill or foundry. The inspection of workmanship will be made as the manufacture of the material progresses, and at as early a period as the nature of the work will permit.

All facilities for inspection of material and workmanship shall be furnished by the Contractor; and the Engineer and his inspectors shall have free access to any of the works in which any portion of the material is being made.

The Contractor shall give the Inspector due notice when any material is ready for inspection. Any delay on the part of the Inspector shall be reported to the Engineer, but no material will be accepted which has not been passed upon by the authorized representative of the Engineer.

METAL.

Unless otherwise specified, all metal shall, for all spans of ordinary length, be medium steel; excepting only that rivets and bolts are to be of soft steel, and adjustable members of either soft steel or wrought iron.

For very long, fixed spans, high steel may be used for top chords, inclined end posts, pins, and eye-bars in bottom chords and in main diagonals of panels where there is no reversion of stress, when impact is included. It may be used also for the web members of cantilever and anchor arms of cantilever bridges, where the variation of stress is comparatively small, and where the impact cannot be great.