One of the most unique labor-saving devices recently IJrought out is the Buc](eye tradion ditcher, designer] to cut trenches and ditches. By means of this ma chine tile trenches are dug entirely without the use of hand laLor, and this is of great im]Jortance, as
total of 14,420 shades. The dyeing establishment was rEorganized in 189 0, and the formuliB and processes for the different colors were kept recorded in a special register, along with samples of the wool Dr silk. In former times the silk which came from the Lyons factories was dyed ,in those establishments, but later on it w�s decided to dye the silk as well as the wool at the Gobelin works. In the register are kept account of the laboratory experiments and of all the manipula tions. In the storehouses are kept a large number o.f spoo.ls Scientific Atnerican. rays of the sun and minimizing the loss from radia tion. The apparatus consists ,of a shallow flat box, covered with two. layers of windo.w glass. separated by a space of about one inch. Coils of piping, painted black, are laid in this box and through them water or some other fluid runs. The light-rays .. of the sun pass through the glass without interference, and are converted to. heat, whiOO� owing to the jacketing of the double' glass and air space, escapes by radiation or induction very slowly, and generates a heat which converts the water in the pipes into. steam. The 97 Spark-Producing Metal ..
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