PAINTING. 2/3 



"It is expected that the following series of experiments can 

 be conducted through the cooperation of railroads and consumers 

 on one hand, and the manufacturers of standard coatings on 

 the other, the former to provide the structure and labor and 

 the latter the material to be applied: 



11 It is recommended that two coats of the protective coating 

 be applied to parts of full-sized structures, not less than one 

 span of a bridge, one steel freight-car, or, in general, one unit 

 of dimensions corresponding to above, the surface to be pre- 

 pared and coating to be applied as recommended under those 

 headings. 



"At the same time, panels of tank steel 20X24X1 in. are 

 prepared and coated in the same manner as the structure and 

 with the same batch of coating. The panels are coated on both 

 sides and on edges of sheet. The work to be done indoors under 

 favorable conditions for drying. 



" The panels are to have a ^-in. hole bored in middle of upper 

 end to facilitate hanging, and are to be stamped with serial number 

 on both sides in upper left-hand corner. 



" Panels are prepared as above in pairs, one to be exposed 

 green' and the other to be thoroughly dried under favorable 

 conditions before testing. The corresponding pair of 'green' 

 and dry panels are exposed under the roofs of train sheds, in 

 roundhouses directly over smoke-stacks of engines, from trusses 

 of bridges, on roofs of train sheds, roundhouses, and on roofs 

 adjoining power-house stacks, etc., in tunnels, on docks in salt 

 water and tidal rivers, where they will be immersed twice every 

 twenty-four hours in salt and fresh water in the ebb and flow 

 of tides. 



In addition to above series of field panels, special laboratory 

 panels on glass and tank steel are prepared in the same manner 

 as the foregoing. The steel panels are exposed to the acticr* 

 of exhaust steam at a temperature not to exceed 150 F. foi 



