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The replacement of cut stone tools by polished stone tools is not the most important innovation, although it is the one that gives the period its name. The diversification of tasks that needed to be done (cutting down trees, sowing seeds, harvesting cereals, much of the grain...) explains that the first farmers had to create new specific tools ...
Various window blind styles. A window blind is a type of window covering. [1] There are many different kinds of window blinds which use a variety of control systems. A typical window blind is made up of several long horizontal or vertical slats of various types of hard material, including wood, plastic or metal which are held together by cords that run through the blind slats.
The interior of a wheellock mechanism from a "puffer" or pistol made in Augsburg in about 1580. The mechanism is shown at rest, with the long arm of the mainspring resting on the bottom of the wheel bracket. Invisible behind the wheel bracket is the chain linking the end of the mainspring with the eccentric on the wheel shaft.
The censer will usually have three outer chains (for the Holy Trinity) attached to the bowl, and a fourth inner chain (for the Oneness of God) attached to the lid. The three outer chains are gathered together and attached to a round conical plate attached to a ring; the inner chain passes through a hole in the conical plate and is attached to ...
Rigid chain actuators were developed from “chain rammers” that used a single “ram chain” thrust from a magazine to load heavy-caliber ordnance into the breech of a cannon. Robert Matthews received a US patent for his “Mechanical Rammer” in 1901 which used a roller on the leading end of the chain to guide it and allow thrust without ...
Huygens' maintaining power in use. The weight drive used by Christiaan Huygens in his early clocks acts as a maintaining power. In this layout, the weight which drives the clock is carried on a pulley and the cord (or chain) supporting the weight is wrapped around the main driving wheel on one side and the rewinding wheel on the other.
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