An appliance consisting of two hydraulically operated booms with a cage at the upper end. The larger sizes may also have a hydraulically operated arm provided to extend the length of the upper boom. Appliances range in size from a maximum platform height of 15. 25 m to 31. 5 m (50 to 103 feet). The booms can be operated from the cage and can be rotated through 360°. The cage is fitted with a monitor for use as a water tower and can also be used for rescue purposes