按键盘上方向键 ← 或 → 可快速上下翻页，按键盘上的 Enter 键可回到本书目录页，按键盘上方向键 ↑ 可回到本页顶部！
————未阅读完？加入书签已便下次继续阅读！
project 12 to 18 inches at each end beyond the line of
the wall。 Let the passage ends be entirely given to
either window or glass door。 Twenty…four pairs of
trams run across the room。 On them are placed 56
bookcases； divided by the passage； reaching to the
ceiling； each 3 feet broad； 12 inches deep； and separated
from its neighbors by an interval of 2 inches；
and set on small wheels； pulleys； or rollers； to work
along the trams。 Strong handles on the inner side of
each bookcase to draw it out into the passage。 Each
of these bookcases would hold 500 octavos； and a room
of 28 feet by 10 would receive 25；000 volumes。 A room
of 40 feet by 20 （no great size） would receive 60；000；
It would； of course； be not properly a room； but a
warehouse。
End