Abstract: A boom for spraying equipment comprises at least one elongate member having an outer skin over a core of a material having a lower density than the skin. The core material may occupy all of the space within the outer skin or the elongate member may be hollow, at least part of a side wall of the member being formed of an outer skin, an inner skin and core material sandwiched between the inner and outer skins. The outer skin and the core material may be metallic or non-metallic, suitably a fibre reinforced plastics material. There may be a plurality of elongate members which are mutually spaced, parallel arranged and extend in a direction lengthwise of the boom.

Abstract: A device for testing the performance of agricultural, horticultural or the like spraying equipment. The device includes a flowmeter, a fitting for coupling the flowmeter to a nozzle in the equipment, electrical circuit to which an electrical signal from the flowmeter is applied, and a visual display connected to the electrical circuit. In one embodiment, the electrical circuit scales the signal from the flowmeter and the display shows the rate of supply of liquid from the nozzle. In a second embodiment control means are provided for applying to the electrical circuit a signal representing a desired speed of forward travel and width of ground to be sprayed, and the display shows the volume of liquid then applied to unit area of the ground. In a third embodiment the electrical circuit includes a microcomputer and control means include a keyboard.

Abstract: A device for determining the volume of spraying liquid applied to unit area of ground by spraying equipment. The device includes pulse generators for generating first and second electrical signals respectively representing the rate of supply of liquid and the ground speed of the equipment. A function generating unit receives the two signals and, responding to these signals, produces an output signal representing the product of the ratio between the signals and a predetermined factor. The output signal from the comparator is applied to a meter which provides a visual indication of the output signal, this representing the volume of liquid applied to unit area of the ground. An automatic speed control unit can be coupled to an output from the function generating unit or to the means for generating the second electrical signal. This unit is actuated by an operator when the visual indicator indicates that a predetermined supply of liquid to unit area has been achieved.