Another method of fixing the ladders is shown in [fig. 29].
Fig. 29
In this case eye-bolts are driven horizontally into the wall in pairs, rather wider apart than the width of the ladders.
Iron rods hook into these and are fastened to the ladder sides by thumb screws.
The ladders rise above each other and are connected by 3-inch sockets.
When fixed, they stand about 18 inches from the wall. This is an advantage, as it enables the workmen to climb on the inside of the ladders, thus lessening the strain on the eye-bolts, and the ladder can more easily pass a projecting chimney cap.
On the other hand, the whole weight of the ladders rests upon the bottom length, so that if through any cause it gave way, for instance under accidental concussion, the entire length would most certainly collapse.
This danger could be avoided if the ladders were supported on brackets as [fig. 30]. No reliance should be placed upon the thumb screws, as they may work loose under vibration. Danger from this source would be avoided if the slot in which the ladder peg moved was made as shown in [fig. 30].
