scienceclubnerd

Found the pictured item in my backroom several years ago and have had years of students asking what it's for and I do not have an answer for them.  Can anyone help me, this is from Sargent Welch and has no paperwork with it.  It sits at an angle and has a weight in the red portion and the red portion is able to be disattached.  It obviously is for some kind of demo, I presume center of gravity or something but would like more information.  

Thanks.