Abstract: An infusion device includes an upstream pressure control device and a downstream flow control device. The device receives infusion liquid via an inlet and controls the level of liquid in a chamber by means of a float which can close both the inlet and an outlet. A filtered vent maintains atmospheric pressure in the chamber. The device receives infusion liquid at constant head via a flow pipe. A dripper delivers droplets into an airtight chamber. A taper needle renders an orifice adjustably open to a desired degree to deliver liquid at a selected rate. Screw threaded adjustment and calibration means allow calibrated adjustment. A flow pipe delivers a metered flow of infusion liquid for infusion into a human or animal body.

Abstract: An infusion device (310) includes an upstream pressure control device (344) and a downstream flow control device (320). The device (344) receives infusion liquid via an inlet (348) and controls the level of liquid in a chamber (346) by means of a float (350) which can close both the inlet (348) and an outlet (368). A filtered vent (362) maintains atmospheric pressure in the chamber (346). The device (320) receives infusion liquid at constant head via a flow pipe (316.1). A dripper (341) delivers droplets into an airtight chamber (324). A taper needle (330) renders an orifice (328) adjustably open to a desired degree to deliver liquid at a selected rate. Screw threaded adjustment (336) and calibration means allow calibrated adjustment. A flow pipe (316) delivers a metered flow of infusion liquid for infusion into a human or animal body.

Abstract: Agricultural soil is acidified by applying fertilizer, especially in the form of a clear solution, having an undesirably low pH value. The invention provides for applying a liquid neutralizing reagent in the vicinity of the fertilizer, and in the same operation as applying the fertilizer. A device for treating the soil has a liquid container, a conduit and dispensing means for applying the neutralizing agent. The device can form part of a cultivating implement having fertilizer applying means, e.g. a seed planter.

Abstract: A seed planting device has a planting wheel rotatable about an axis 74 to roll over a land 38. Hollow tines 50 mounted at angular spacings on the wheel 22 extend outwardly. A seed cell 66 in each tine has an inlet 118 for receiving a seed and an outlet 69 towards an outer end. A seed dispensing mechanism 56 dispenses seeds individually to the seed cells via ducts 60. A release member 70 in each seed cell is movable between a retain condition for retaining a seed and a release condition for releasing the seed.

Abstract: In calibrating agricultural apparatus for administering agricultural chemical to an agricultural land at a required land concentration, the agricultural apparatus is operated under a predetermined condition to dispense a specimen amount of chemical, which is contained in a container of predetermined cross section. A nomogram, relating specimen amounts of chemical to land concentrations taking into account said predetermined condition, is located on the container such that a zero mark of the nomogram corresponds to a bottom of the container. The level of the specimen amount in the container is observed in relation to the nomogram and is related to a corresponding land concentration. Said land concentration is compared to the required land concentration and the agricultural apparatus is adjusted accordingly.

Abstract: Apparatus 10 administers agricultural chemicals in liquid form to a land. Agricultural chemical 54 is fed from a reservoir 52 to a liquid chemical container 12. Control means 16, for example level control means including a float valve arrangement, controls the inflow of liquid chemical into the container 12 to keep liquid chemical within the container at a constant level. Liquid chemical flows under gravity under a constant hydraulic head via a composite flow line 18, (44, 46,50) and flow restrictors 20 to administering means 22 which deposits it on a land, conveniently in furrows in a seed bed. Flow rate adjustment takes place by selecting suitable flow restrictors 20, or by adjustment of the control means 16 to effect a suitable level (hydraulic head), or both.