Early electrical workers used it as a coating to insulate coils, and molded it into stand-alone insulators by pressing together layers of shellac-impreg-nated paper.
Therefore we point out a new method of testing fragile material's strength of extension.That is to say we can measure the disk's strength of extension by pressing in its diametric.
A little bag like that used in finger pressing is applied, with fifteen aromatic plants including wheat, cinnamon, yellow ginger powder, monarda, lavender, lime peel and moss rose contained in it.