the toothed segment the ladder or ladders can be raised and retained in an upright or inclined position as may be desired. It also consisis in the arrangement of slotted tubular side rails in combination with the rounds of the several ladders in such a manner that the side rails of each ladderguide and strengthen the guide rails of the next suc ceeding ladder while at the same time the rounds of the inner lad ders are supported and strengthened by the slots in the side rails of t next preceding ladder 0 1861 SCIENTIFIC AMERICAN INC., 1861-08-11
Keywords:
toothed segment, ladder, ladders, raised, retained, upright, inclined position, desired, consisis, arrangement, slotted tubular side rails, combination, rounds, several ladders, manner, side rails, ladderguide, strengthen, guide rails, next suc ceeding ladder, time, rounds, inner lad ders, supported, strengthened, slots, side rails, t next preceding ladder 0 1861 SCIENTIFIC AMERICAN INC, 1861-08-11, science, scientific, sciences, mind, health, tech, sustainability, publication, lab, sciam, sa, scientist, research, american, experiment, education, discovery, technology, analysis, magazine, u.s., insights, developments, weekly, broadsheet, inventor, innovation, inventions, patented, industrial revolution, emerging, trends, monthly magazine, united states, engravings, curious works, paper, discover, Scientific Paper, Weekly Journal, Practical Information, Art, Science, Mechanics, Chemistry, Manufactures, research, education, scientist, innovation, 19th century, vintage, america, Rufus M. Porter, 1845, journal, academic, newspaper illustrations, retro style, old-fashioned, media illustrations, victorian style, news, newspaperheadline, 19th century style, illustration, journalism
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