Sentence:  It frequently happens that trees fall across one another, forming what is known as a <WSD>jackpot</WSD>. A number of trees may fall in a single <WSD>jackpot</WSD>. One of the tools with which appellant claims a bucker should be provided is an undercutter rigging. When trees are in a <WSD>jackpot</WSD>, the proper method of procedure is to first cut the lower tree, and then the upper one. This lessens the liability of an upper log rolling or falling upon the workman while he Is engaged in cutting the lower tree. The cut of the lower tree is ordinarily made by sawing it from the upper side, but, when its position produces a strain which pinches the saw, it is sawed from the under side by what is known as an undercut. To make an undercut, it is necessary to have some appliance to support the moving saw which is then operated teeth upward. The appliance which appellant contends Is ordinarily used is known as an undercutter rigging. Having no undercutter rigging, appellant requested respondent's foreman to provide one, complaining that his work in a <WSD>jackpot</WSD> of large trees without one was unsafe and dangerous. 
Meaning of the word marked with <WSD> tags:  A jumble of felled timber.