Abstract: An adjustable arm for mounting an article on a tripod which is composed of first and second arms connected by an interposed joint member, said joint member having two halves pivotally arranged adjacent one another on a common axle, one end of each of the first and second arms being attached to and extending from each of said halves, respectively, connecting means at the unattached ends of each of the arms for adjustably connecting each of the arms to an article and a tripod, respectively, means for pivotally positioning said joint halves and the attached arms about the axle and means for locking each of the connecting means and the joint halves in a fixed position.