Scientific American Volume 21 Number 20 (November 1869) . the wheel, B, will be imparted throughth? bars and rock-bars, G, H, J, and L, to the annular frame and the screen, N, all the parts of the latter revolving arounda center in the oval aperture through the center of N, the ex-terior edges of which will intercept the light on the exterioredge of the background of the vignette, and soften it, butwithout some further provision the machine could not imitatehandwork, as it is frequently desirable, to soften off the back-ground more at the top than at the bottom, or vice versa. Inorder to do th
Scientific American Volume 21 Number 20 (November 1869) . the wheel, B, will be imparted throughth? bars and rock-bars, G, H, J, and L, to the annular frame and the screen, N, all the parts of the latter revolving arounda center in the oval aperture through the center of N, the ex-terior edges of which will intercept the light on the exterioredge of the background of the vignette, and soften it, butwithout some further provision the machine could not imitatehandwork, as it is frequently desirable, to soften off the back-ground more at the top than at the bottom, or vice versa. Inorder to do this the pivot which works in the slot in the lowerarm of the rock-bar, H, and through which the rock-bar, H,imparts motion to the rock-bar, J, projects from a slide, T,which is adjustable upon the rock-bar, J, being held at anypoint desired by a spring pawl, U, which engages with a rack -%li__—= : substitute for many of thethis purpose. For further information, address WWashington Place, New York city. implements heretofore used forH. Howland, 26 West. Steering by Steam. A correspondent who was present at the occasion of a re-cent trial of the steam steering apparatus with which thesmall steamer Worth Star, of Muskegon, has been supplied,writes to the St. Louis Dispatch as follows: The experiment was such a complete and marked success-mechanically, and seems in its principle to foreshadow suchimmense benefits to steam navigation, that it deserves theearnest and instant attention of the public. While the ar-rangement of the machinery connected therewith is simplicityitself, the result on the motions of a vessel are instantaneous,and as powerful as can be desired. Instead of a cumbrouswheel in the pilot house, a lever like the starter of a locomo-tive stood up from the floor, which worked either way fromside to side by no heavier pressure than could he given by thethumb and finger, but which made the North Star, a long, nar-row river boat, almost tarn on her centre, and then as
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectiron, booksubjectsoci
