Search results
Results from the WOW.Com Content Network
A pinwheel calculator is a class of mechanical calculator described as early as 1685, and popular in the 19th and 20th century, calculating via wheels whose number of teeth were adjustable. These wheels, also called pinwheels, could be set by using a side lever which could expose anywhere from 0 to 9 teeth, and therefore when coupled to a ...
A partially disassembled Curta calculator, showing the digit slides and the stepped drum behind them Curta Type I calculator, top view Curta Type I calculator, bottom view. The Curta is a hand-held mechanical calculator designed by Curt Herzstark. [1] It is known for its extremely compact design: a small cylinder that fits in the palm of the hand.
An open frame style crate used for a bicycle An early open style crate for heavy cast iron A sheathed (closed) plywood crate A sheathed (closed) lumber crate Wooden crate with cleating. A wooden crate [3] has a self-supporting structure, with or without sheathing. For a wooden container to be a crate, all six of its sides must be put in place ...