250 pounds best bolted American Paris white,
fine white barytes,
siccatized linseed oil,
special solution as above.
Note. The siccatized linseed oil is made in the cold way in a revolving barrel or drum as follows:
For 25 gallons placed in the apparatus, add 50 pounds sifted litharge and let it revolve by power for 8 working hours, then draw the resulting oil into a settling barrel or tank and permit the oil to clear. The residue, which consists of litharge and oil foots can be used with cheap roof paints.