Abstract: The salesperson sets a predetermining counter on the amount required. The minnows are then placed in the separating tank where they are moved through two funnels at each end of the tank via water force on and through a sensing area where their presence is registered and thus counted.Movement of the minnows from the separating tank is effected by a combination of whirlpool current and natural habitat effect draw the minnows through clear flexible plastic tubing. The fluid current now confined to one solid stream moves the minnows through the sensor area on and to the holding tank. The minnows are caught in a wire mesh strainer basket in the holding tank, which allows the water to continue to circulate through the drain pipe from the holding tank to pump and reservoir tank. The water is then recycled through the pump back to the separator tank.When the counter reaches zero, normally open contacts close, causing the solenoid valve to shut off the flow of water and minnows, also de-energizing the pump.

Abstract: An electronic control logic system for processing the results of a spectrophotometer analysis of a serum chemistry comprised of a serum and one or more chemical reagents. The spectrophotometer output representing air as a light path and another output representing the test chemistry as a light path are integrated and the air path integrated value allowed to exponentially decay until its value is equal to that of the integrated test chemistry path value. The decay time is converted into a train of digital pulses representative of the optical density of the test chemistry. These pulses are counted and their total stored for comparison with the corresponding optical density of a standard solution. The concentration of the element for which the particular test was designed to detect is known for the standard solution, so the percentage concentration of that element in the test chemistry may be thereby ascertained.