No. L.
Reading edition
A complete light portable ladder, which taken out of one's pocket, may be by himself fastened an hundred feet high to get up by from the ground.
NOTE.
A number of light brass tubes, each having a socket to receive the end of the preceding joint, may be raised to any given height, and with the assistance of small loops of cord will fully answer the purpose here described. It will be necessary to have a small stud at one end of each joint, with a narrow slit at the end of the following tube to receive it, which being carried on in a right angle for about twice its width, will on being turned round serve as a key to prevent the joints separating.