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Drivers of tractors, animal-drawn vehicles and two-wheeled vehicles may also extend their left arm horizontally with the palm facing forwards. Signal lights or turn indicators may be used in place of hand signals if installed. [2] [3]
The hand is held parallel to the ground (face down) and rocked slightly. [27] [better source needed] Signal for Help is a single-handed gesture that can be used over a video call or in person by an individual to alert others that they feel threatened and need help. The signal is performed by holding one hand up with the thumb tucked into the ...
The Chinese variant became much more complex including pointing (using both forefinger and middle finger instead of forefinger-only as in Japan, and used when checking signals, doors, speed and other major aspects) and caution (bending the right elbow by 90° and lifting the forearm upright, used when a checking procedure is finished or caution ...
A US Navy crewman signals the letter 'U' using flag semaphore during an underway replenishment exercise (2005). Flag semaphore (from the Ancient Greek σῆμα (sêma) 'sign' and - φέρω (-phero) '-bearer' [1]) is a semaphore system conveying information at a distance by means of visual signals with hand-held flags, rods, disks, paddles, or occasionally bare or gloved hands.
Agricultural implement ISOBUS plug. ISO 11783, known as Tractors and machinery for agriculture and forestry—Serial control and communications data network (commonly referred to as "ISOBUS") is a communication protocol for the agriculture industry based on, and harmonized with, the SAE J1939 protocol (which is based on the CAN bus).
The idea of a driverless tractor has been around since as early as 1940, when Frank W. Andrew invented his own. To guide his driverless tractor, a barrel or fixed wheel would be put in the center of the field and around it would wind a cable attached to a steering arm on the front of the tractor. [3]
The Army finally decided in 1935 to purchase only wheeled artillery tractors, and no more were sold in the UK, but the Medium Dragon Mark IV sold well in export versions up to 1937. From c. 1929 Vickers-Armstrongs also made the Light Dragon tractor for towing light artillery, with a similar name but of a completely different design based on the ...
Occupy movement hand signals, grouped by function. The Occupy movement hand signals are a group of hand signals used by Occupy movement protesters to negotiate a consensus. [1] [2] [3] Hand signals are used instead of conventional audible signals, like applause, shouts, or booing, because they do not interrupt the speaker using the human microphone, a system where the front of the crowd ...