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An Army Jump Master giving the hand signal for "30 seconds" over a drop zone. Hand and arm signals for United States Army use were first established in Field Manual 21-60. They were amended in Training Circular 3-21.60. [1] Hand and Arm signals are one of the most common forms of communication used by United States Army soldiers or group of ...
Lifting loads using a vehicle-mounted crane (loads lifted using a fixed crane are supervised by a banksman) Guiding military vehicles (also called ground guiding) Dumping materials, such as from a dump truck; Guiding oversized loads. The spotter's advantage is the ability to move around the load or vehicle to determine the best trajectory.
The hand signal "OK" Diver communications are the methods used by divers to communicate with each other or with surface members of the dive team. In professional diving, diver communication is usually between a single working diver and the diving supervisor at the surface control point.
What is now the International Code of Signals was drafted in 1855 by the British Board of Trade and published in 1857 as the Commercial Code. It came in two parts: the first containing universal and international signals, and the second British signals only. Eighteen separate signal flags (see chart) were used to make over 70,000 possible messages.
The banksman is in charge of the crane movements from the point of loading and unloading. They may use a system of hand signals or a radio link. A banksman may also be responsible for directing the movement and loading/unloading of lorries, or directing the movement of other plant. [ 3 ]
In order to hook and unhook the loads, the operator usually works in conjunction with a signaller (known as a "dogger", "rigger" or "swamper"). They are most often in radio contact, and always use hand signals. The rigger or dogger directs the schedule of lifts for the crane, and is responsible for the safety of the rigging and loads.
A Safe Load Indicator (SLI) or an Automatic Safe Load Indicator (ASLI) is a device which is installed on mobile or portal cranes to alert the operator if the lift is exceeding the safe operating range of the machinery. [1] In some cases, the device will physically lock the machinery in circumstances it determines to be unsafe.
Canadian Rule Books contain all hand signals, voice signals and flag signals as well as fixed trackside signal indications necessary for operation. These rule books specify various methods of operation in both signaled territory and dark territory , where manual methods of granting track authority must be used.