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An elevator or lift is a vertical transport vehicle that efficiently moves people or goods between floors of a building. They are generally powered by electric motors that either drive traction cables and counterweight systems, or pump hydraulic fluid to raise a cylindrical piston.

Elevator Car

An elevator or lift is a vertical transport vehicle that efficiently moves people or goods between floors…

"General arrangement of Apron Conveyor for loading vessels, pans are 48 inches wide, 12 inches pitch, attached to chains working over sprockets at 24 fee centers. Capacity of conveyor is about 250 tons of coal per hour, material being received from a 42 inch M. & G. belt conveyor. The Apron Conveyor will work at any angle, the outer end being raised or lowered to suit vessel." -Meese, 1913

Apron Pan Conveyor

"General arrangement of Apron Conveyor for loading vessels, pans are 48 inches wide, 12 inches pitch,…

For safety, a rigid ladder should be leaned at an angle of about fifteen degrees to the vertical. In other words, the distance from the foot of the ladder to the wall should be about one quarter of the height of the top of the ladder. At steeper angles, the ladder is at risk of toppling backwards when the climber leans away from it

Four Wheeled Cart Mount for Ariel Ladder

For safety, a rigid ladder should be leaned at an angle of about fifteen degrees to the vertical. In…

A ladder is a vertical or inclined set of rungs or steps. There are two types: rigid ladders that can be leaned against a vertical surface such as a wall, and rope ladders that are hung from the top.

Six Step Ladder

A ladder is a vertical or inclined set of rungs or steps. There are two types: rigid ladders that can…