108 



PAINT TECHNOLOGY AND TESTS 



side of the fence. Thus for one paint formula there were required 

 18 panels, or 6 painted in each color and on 3 grades of wood. 



Paints for Tests. The mixed paints received for the tests 

 were in quart cans, having been especially prepared from the 

 formulas submitted to manufacturers by the technical com- 

 mittee in charge of the work. They were properly labeled with 

 their number and color, in each case. The formulas decided 

 upon for the test are described later. The various white leads 

 and other single pigment paints which were used were received 

 in kegs weighing 12| pounds each, having been bought in the open 

 market and then given a formula number. The formulas of 

 the paints designed for both the Atlantic City and Pittsburg 

 tests, as well as the numbers of the panels upon which the paints 

 were applied, are shown on pages 131-133-145. The analysis 

 of one of the combination paints applied is herewith given, to 

 show the correct method of stating the composition of a paint. 



FORMULA No. 20, ATLANTIC CITY TEST FENCE 

 Percentage Composition 



Brushes. Heavy 7-O round bristle brushes were used for 

 the priming coat so that the paint might be well worked into 

 the wood, while for the second and third coats three-inch chisel 

 edge brushes were used. These brushes were, of course, washed 

 several times with turpentine after painting each panel, so that 

 pigments from one paint could not be carried over into a paint 

 containing other pigments. 



Shellacking Panels. The shellacking of any bad places of 

 minor nature which may have been present on the surfaces of 

 some of the panels, was done with the highest grade orange 

 shellac. It was thought advisable to determine whether shel- 

 lacking over the priming coat of paint or on the bare wood 



