A Jacob´s ladder is a favorite project of high voltage enthusiasts. It makes a visually attractive and fun display of a high voltage electrical arc climbing a pair of electrodes. [Keystone ...

The articulated moveable siege ladder, usually referred to simply as the siege ladder, is one of a class of weapons used in offensive siege warfare. It is the simplest, and probably the oldest, of the ...

Fixed and Portable Ladders: OSHA’s 1910 Walking-Working Surfaces and Fall Protection Standards This free guide to ladder safety regulations summarizes the relevant standards from various parts ...