The process employed in Germany for the manufacture of lamp-black is to conduct the products of the combustion of any resinous matter in a furnace into a long flue, at the end of which is placed a loose hood, made of some woollen material, and suspended by a rope and pulley. The lamp-black collects in this hood, and, when a sufficient quantity has accumulated, is shaken down and removed. In this manner about 6 cwt. of lamp-black may be collected in twenty-four hours. One form of the apparatus is shown in Fig. 6. The circular structure _a_ is lined inside with hanging cloths upon which the black can condense, and is covered with a conical roof from which depends a movable sheet-iron cone _b_, perforated at its apex to give egress to a current of air. This cone _b_ is supported by a rope _g_ passing over a pulley _c_ and accessible from the outside. A fireplace _d_, containing a small iron dish _e_ for holding the resin, is built against one of the side walls of the structure in such a manner that it can be fired externally. The rate of combustion is regulated by a small sliding damper on the door of the fireplace. When the black has accumulated in the chamber _a_ to such an extent that operations must be suspended, the fire is let out, and the chamber is left to cool entirely, so that the black may not ignite on contact with the air. The cone _b_ is then lowered, and in its descent scrapes the walls of the chamber _a_ and causes the black to collect on the floor, whence it is removed through an iron door _f_ which at other times is kept tightly luted. [Illustration: Fig. 6.--APPARATUS FOR MAKING LAMP-BLACK.] In England, an inferior variety is sometimes obtained from the flues of coke-ovens. That known as _Russian lamp-black_ is made by burning chips of resinous deal or pine wood, and collecting the soot formed; but it is objectionable, owing to its liability to take fire spontaneously when left for a long time moistened with oil. A modified form of apparatus has been introduced by Thalwitzer, a German manufacturer, and is shown in Figs. 7 and 8. A vertical tube is provided at its upper end with a funnel, into which cooling water is poured and flows out through openings in the tube immediately above a circular plate of thin cast or wrought iron arranged horizontally and [Illustration: Figs. 7 and 8.--THALWITZER’S LAMP-BLACK APPARATUS.]