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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.
A rudder angle indicator is a device used to indicate the present position of the rudder blade, usually fitted near the Ship's wheel on the bridge and in the engine control room. [1] Rudder angle indicator of the MS Nordstjernen (1956) Rudder angle indicator
Dover Corporation is an American conglomerate manufacturer of industrial products. [5] The Downers Grove, Illinois-based company was founded in 1955. [5] [6] As of 2021, Dover's business was divided into five segments: Engineered Products, Clean Energy and Fueling, Imaging & Identification, Pumps & Process Solutions and Climate and Sustainability Technologies. [7]
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The first of these systems used mechanical clutches between luffing and hoist drums, giving simplicity and a "near level" result. [ 5 ] Later systems have used modern electronic controls and quickly reversible motors with good slow-speed control to the hoist winch motors, so as to give a positioning accuracy of inches.
A boom blocking the River Foyle during the siege of Derry. A boom or a chain (also boom defence, harbour chain, river chain, chain boom, boom chain or variants) is an obstacle strung across a navigable stretch of water to control or block navigation. In modern times they usually have civil uses, such as to prevent access to a dangerous river ...
Space Force officials have admitted that sonic booms from Vandenberg affect over 100 miles of California coast, just as SpaceX aims to ramp up launches.
In sailing, a boom is a spar (pole), along the foot of a fore and aft rigged sail, that greatly improves control of the angle and shape of the sail. The primary action of the boom is to keep the foot flatter when the sail angle is away from the centerline of the boat. The boom also serves as an attachment point for more sophisticated control lines.