Abstract: An anti-theft equipment locking cover, including a first cover part adapted to overlie a first part of an item of equipment; the first cover part having a flange adapted to underlie a first edge of the item of equipment; a second cover part to overlie a second part of the item of equipment; the second cover part having a flange adapted to underlie a second edge of the item of equipment; the first and second cover parts being disposed in confronting relation to one another so that the item of equipment is fully covered by the confronting first and second cover parts; a tab secured to the first cover part; a slot formed in the second cover part that slideably receives the tab; a distal free end of the tab extending through the slot; an aperture formed in the distal free end of the tab; and a locking device adapted to extend through the aperture to prevent retraction of the tab from the slot.

Abstract: A sedimentation recorder including an optical tracking head controlled to track the liquid-solid separation boundary in a tube containing a sample of liquid-solid mixture. The tracking head is controlled by a pulse operated servomotor which responds to the output of a photodetector mounted in the tracking head. A two-pen plotter is provided to record the sedimentation behavior of the sample. One pen is connected to the tracking head and continuously records the position of the liquid-solid separation boundary to provide a settling curve. The other pen is driven by a rate of change mechanism and records the approximate rate of change of the separation boundary position. The rate of change mechanism operates by measuring the excursion of the tracking head during each of a series of successive time intervals. The difference between each excursion measurement and the preceding measurement is calculated and each difference value is converted into a corresponding number of pulses.