spatter, slag, flux and other deleterious substances removed, and receive two thorough shop coats of "Zine Chromate Primer", color green, and a field touch-up of all marred surfaces and field connections with the same material after erection and proper cleaning as above specified. Surfaces inaccessible to painting after fabrication shall be painted before fabrication, except machined contact surfaces, or surfaces to be riveted or welded together, or other surfaces to retain bond to concrete shall be protected with an approved coating, as specified below, in lleu of paint. Paint shall be applied only to thoroughly dry surfaces under dary atmospheric conditions and with approved equipment in the hands of skilled workmen. Coverage shall be even, full and without runs or sags. Where it is required to retain unpainted surfaces until erection, fabrication, or installation in the field, steel shall be given one coat of "Keystone Rust Preventative" medium grade, or equal, primer which can be removed with solvent in field. 6-11. PACKING AND SHIPPING: All material and assembled units shall be boxed, crated or bundled securely and s0 loaded as to suffer no damage in transit. Maximum weight of bundles shall be 2500 lbs., except packaged unit assemblies which may exceed this weight. Gross weight shall be marked on each bundle. All rivets, bolts, clips. and other devices for use in fleld erection shall be separately packed, suitably marked, coded and indexed and shall be securely boxed in packing boxes of 2" matertal reinforced with metal strap bindings. All other items which may be bent or damaged in shipment shall be securely crated or boxed to the satisfaction of the purchaser. Duplicate copies of index of box contents will be packed inside each box and in a heavy manila envelope tacked to the outside of each box. Duplicate copies of all lists will also be furnished direct to the purchaser for use in supervising erection. Gross weight shall be marked on each package. 6-12. DAMP PROOFING: Interiors of all boxes, crates, and bundles for shipping shall be lined with doubled layers of "Sisalkraft" or similar tear-resistant water- proof paper with overlapped joints. All metal items not galvanized or coated with rust preventative paint shall be coated with heavy grease or Cosmoline before packing. All fabricated units shall be securely blocked, cleated and strapped or lagged to the inside of crates or boxes so that there will be no movement or shifting ir transit. Silica Gel dessicants will be inserted in all crates, boxes or sealed packages. 6-4