Hudson's contrivanceFig.251.represents the construction of this ingenious apparatus, shown partly in section.a ais a vessel of iron, supported upon wooden standardsb b, over the upper surface of which vessel a sheet or diaphragm,c c, of oiled cloth, or other suitable elastic material, is distended, and made fast at its edges by being bent over a flange, and packed or cemented to render the joints water-tight. A vertical pipedis intended to conduct water to the interior of the vessela, and, by a small elevation of the column, to create such upward pressure as shall give to the diaphragm a slight bulge like the swimming tub.An endless web,e e e, passing over the surface of the diaphragm, is distended over three rollers,f g h, the lower of which,f, is in contact with the colour-rolleriin the colour-troughK. On the axle of the rolleria pulley wheel is fixed, which allows the roller to be turned by a band from any first mover; or the roller may receive rotatory motion by a winch fixed on its axle. On this said axle there is also a toothed wheel, taking into another toothed wheel on the axle of the rollerf; hence, the rotation of the colour-rolleriin the one direction will cause the rollerfto revolve in the opposite, and to carry forward the endless webe e e, over the elastic diaphragm, the web taking with it a stratum of colour received from the rolleri, evenly distributed over its surface, and ready for the printer to dip his block into.The axles of the rollersfandgturn in stationary bearings; but the axle ofhis mounted in sliding nuts, which may be moved by turning the screwsm, for the purpose of tightening the endless web. The axle of the colour-rolleriturns in mortises, and may be raised by screwsn, in order to bring its surface into contact with the endless web. To prevent too great a quantity of colour being taken up, the endless web passes through a long slit, or parallel aperture, in a frameo, which acts as a scraper or doctor, and is adjustable by a screwp, to regulate the quantity of colour carried up. The contents of the vessela, and of the colour-troughK, may be discharged when required by a cock in the bottom of each. SeePaper Hangings, for theFondustyle.
Hudson's contrivance
Fig.251.represents the construction of this ingenious apparatus, shown partly in section.a ais a vessel of iron, supported upon wooden standardsb b, over the upper surface of which vessel a sheet or diaphragm,c c, of oiled cloth, or other suitable elastic material, is distended, and made fast at its edges by being bent over a flange, and packed or cemented to render the joints water-tight. A vertical pipedis intended to conduct water to the interior of the vessela, and, by a small elevation of the column, to create such upward pressure as shall give to the diaphragm a slight bulge like the swimming tub.
An endless web,e e e, passing over the surface of the diaphragm, is distended over three rollers,f g h, the lower of which,f, is in contact with the colour-rolleriin the colour-troughK. On the axle of the rolleria pulley wheel is fixed, which allows the roller to be turned by a band from any first mover; or the roller may receive rotatory motion by a winch fixed on its axle. On this said axle there is also a toothed wheel, taking into another toothed wheel on the axle of the rollerf; hence, the rotation of the colour-rolleriin the one direction will cause the rollerfto revolve in the opposite, and to carry forward the endless webe e e, over the elastic diaphragm, the web taking with it a stratum of colour received from the rolleri, evenly distributed over its surface, and ready for the printer to dip his block into.
The axles of the rollersfandgturn in stationary bearings; but the axle ofhis mounted in sliding nuts, which may be moved by turning the screwsm, for the purpose of tightening the endless web. The axle of the colour-rolleriturns in mortises, and may be raised by screwsn, in order to bring its surface into contact with the endless web. To prevent too great a quantity of colour being taken up, the endless web passes through a long slit, or parallel aperture, in a frameo, which acts as a scraper or doctor, and is adjustable by a screwp, to regulate the quantity of colour carried up. The contents of the vessela, and of the colour-troughK, may be discharged when required by a cock in the bottom of each. SeePaper Hangings, for theFondustyle.