Merely coating wood or timber with coal tar or other tar, he finds of but little advantage. Moll's British patent was granted in 1836, and is the more interesting, as his process is based on the ...

These colors, for there are many of them, have been prepared from the alkalies of coal tar by Messr3 ... Mr. Perkins' process is as follows :— He dissolves in water the sulphates of aniline ...

As sealcoating contractors begin their season many of them, particularly those accustomed to using refined coal tar sealer ... "Until this process was developed no one had been able to emulsify ...