Ross indexed the following pages under the keyword: "Hour glass system".

Summary: Assuming each variable has a fixed chance of getting equilibrium, it is shown that a system of n1, variables dominating n2 will in 1-pn2 cases get equilibrium by getting it in the n1 and then in the n2, while in pn2 cases it will get the whole simultaneously, the latter proportion being vanishingly small. Experiment will therefore demonstrate the equilibrium appearing in stages. Hour glass system defined 1357 1358

Summary: The idea of a "constraint" added to a dynamic system may have meaning with Newtonian dynamics but it has no general meaning. And the idea of thereby losing a "degree of freedom" is also of restricted applicability. Hour glass system properties 1419 1420

Hour glass system example Summary: A simple practical example of the "hour-glass" type of organisation. Higher geometry of fields and matrix theory [5]: If some variables in a complete system are unobservable, a path fixed by n t,x combinations can be accertained empirically, by using substitute variables, 1413, numerical example 1470. 1469 1470

Channel capacity of absolute systems Summary: Channel capacity in a machine. Hour glass system transmission of information 3800 3801