. Scientific American Volume 06 Number 21 (May 1862) . is opera-ted with great facility. Fig. 1, shows the ventilator turned down in a hor-izontal position, Fig. 2, is a back view in its normalposition, and Fig. 3, is a perspective. A circularopening is cut through the wall, and is covered bythe wheel, 13, which is fixed rigidly in place. Thecentral portion of this wheel is crossed by radialarms, and half of the segments between these arms III/. J silvering looking glasses. Lead and mercury unitereadily in various proportions. An amalgam of 3parts mercury, 1 of lead, and 1 of bismuth, is re-ma
. Scientific American Volume 06 Number 21 (May 1862) . is opera-ted with great facility. Fig. 1, shows the ventilator turned down in a hor-izontal position, Fig. 2, is a back view in its normalposition, and Fig. 3, is a perspective. A circularopening is cut through the wall, and is covered bythe wheel, 13, which is fixed rigidly in place. Thecentral portion of this wheel is crossed by radialarms, and half of the segments between these arms III/. J silvering looking glasses. Lead and mercury unitereadily in various proportions. An amalgam of 3parts mercury, 1 of lead, and 1 of bismuth, is re-markable for its fluidity, and it may be squeezedthrough leather without separation of the is employed for silvering the interior of hollowglass spheres, previously made clean and warm. Allamalgams may be decomposed at a moderate is taken of this property in what is calledwater gilding, or gilding metallic articles, such asbrass buttons. A small portion of gold is dissolvedin a large quantity of mercury, the brass articles to. A good amalgam for the use of the electrical ma-chine is formed of 4 parts mercury, 2 parts zinc and 1part tin. The zinc should be melted in an iron ladle,the tin added, and afterward the mercury, previouslyheated in another iron ladle, stirring the mixturewith an iron rod. The amalgam should be poured,just before it solidifies, into a wooden or iron box,and be constantly agitated, by shaking until cold. Itshould then be triturated in an iron mortar, andsifted through a small muslin sieve, so as to obtain anextremely fine powder ; this being rubbed up with alittle lard, is to be spread on the rubber of the elec-trical machine with a pallet knife. WILLIAMSS VENTILATOR FOR HOUSES. are filled with plates of window glass ; each alternatesegment being glazed and the others left open. Through the axis of the wheel, 13, a spindle ispassed, and upon the outer end of this spindle asecond wheel, A, is hung in immediate contact withthe wheel
Size: 1779px × 1404px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1860, booksubjectcomb, booksubjectiron
