given one coat of the best carbon primer or any other priming-coat required by the Engineer; which coat shall be thoroughly dried before the metal-work is loaded for shipment. It is absolutely essential that the entire surface of the metal-work be thoroughly cleansed by the most effective known methods, such as the use of wire-brushes, then the painter's torch, and, in certain cases the application of a strong caustic solution, followed by scraping, washing with clean water, and drying.

In riveted work all surfaces coming in contact shall be extra well painted before being riveted together. Bottoms of bedplates, bearing-plates, and any other parts which are not accessible for painting after erection shall have three coats of paint, one at the shop, the other two in the field, before erection. Pins, bored pinholes, turned friction-rollers, and all other polished surfaces shall be coated with white lead and tallow before shipment from the shop.

After the structure is erected the metal-work shall be thoroughly cleansed from mud, grease, or any other objectionable material that may be found thereon, then thoroughly and evenly painted with two (2) coats of paint of any kind that the Engineer may adopt.

All three coats of paint given to the metal-work are to be of distinctly different shades or colors; and the second coat must be allowed to dry thoroughly before the third coat is applied.

No thinning of paint with turpentine, benzine, or other thinner will be allowed without special written permission from the Engineer.

No painting is to be done in wet or freezing weather.

All painting is to be done in a thorough and workmanlike manner, to the satisfaction of the Engineer, and no paint whatever is to be used on the structure without first being approved by the Engineer.

All the materials for painting shall be subject at all times to the closest inspection and chemical analysis; and the detection of any inferior quality of such material, in either shop or field, shall involve  the  rejection  of  all  such suspected material at hand and the  scraping  and repainting  of  those portions  of