Abstract: A method and apparatus for an air core reactor including a plurality of straight members and a plurality of offset members, the plurality of straight and offset members are interconnected to form an orthogonal spiral having an air core therethrough.

Abstract: A support capable of supporting geomatic equipment has hinged legs which allow the legs to pivot about a horizontal axis to selected positions. A hinge lock associated with each of the legs allows the leg to be locked in the selected angular position. Locking of the legs in this manner facilitates stability of the support. The locks are readily engaged and disengaged and can be used to hold the legs in a stowed position.

Abstract: A device for controlling a fluid flow is disclosed. The device includes at least two fluid flow drivers, a plenum disposed to receive a fluid flow from the at least two drivers, and a baffle disposed within the plenum. The plenum has a first cross-sectional area proximate the at least two drivers and a second cross-section area at a distance from the at least two drivers, the second cross-sectional area being an exit for the fluid flow. The baffle has a first edge restrained proximate the first cross-sectional area and a second opposing edge freely disposed proximate the second cross-sectional area. The baffle has a surface area responsive to the fluid flow within the plenum to reduce a backflow if one of the at least two drivers is operational and another is non-operational.

Abstract: A support particularly adapted for supporting a geomatic pole has telescoping legs, each having telescoping leg sections which can be locked by a locking device in a selected position of extension, fixing the length of the leg. The locking device is easily actuated and released and is biased toward a locked position. In an unlocked position, the locking device is positively positioned to inhibit contact with the released leg section so that movement is smooth and unnecessary wear is limited. The locking device has an engagement portion which is constructed to promote locking, but also to facilitate release and limit unnecessary wear of the engagement portion.

Abstract: A support for geomatic equipment such as a geomatic pole has feet which facilitate stability of the pole. The feet are constructed to resist forces applied along legs of the support to which they are connected in both directions, including forces which tend to lift the feet upward. The foot is formed to readily penetrate certain surfaces and to resist withdrawal from the surfaces after penetration. In one embodiment, a fixed connection to the underlying surface may be achieved. The foot is also constructed to resist rotation of the foot and leg to which it is attached which could cause instability of the support.

Abstract: A telescoping leg particularly adapted for use in supporting geomatic equipment is capable of locking in different selected positions of extension. A lock is provided for holding the leg at the selected position of extension. The lock is biased to a lock position, but is capable of being moved and retained in an unlock position by operation of a single thumb on one hand so that locking and unlocking the leg for telescoping movement occupies only one hand.

Abstract: A support capable of supporting geomatic equipment has hinged legs which allow the legs to pivot about a horizontal axis to selected positions. A hinge lock associated with each of the legs allows the leg to be locked in the selected angular position. Locking of the legs in this manner facilitates stability of the support. The locks are readily engaged and disengaged and can be used to hold the legs in a stowed position.

Abstract: A convenient mount and connection system which permit articles, such as articles used in geomatic surveys, to be releasably attached to geomatic supports. Multiple articles may be removably attached at the same height on a geomatic pole by the mount. A connection system allows articles to be mounted in two different ways on two different connectors.

Abstract: Supports for geomatic equipment, and in particular geomatic poles, can come in the form of bipods and tripods. The support system can be selectively configured as a bipod support and as a tripod support. No modification needs to be made to the geomatic pole, the system is independently capable of configuration. The position of legs of the supports is particularly selected to provide stability in both the bipod and tripod configurations.