notches
11Notch code — A notch code is a set of notches or recesses cut into the edge of a piece of sheet film to provide a tactile way to identify the film brand, type, and processing chemistry (e.g. black and white, color negative, or color reversal) in the dark. It… …
12Ishango bone — The Ishango bone is a bone tool, dated to the Upper Paleolithic era, about 18000 to 20000 BC. It is a dark brown length of bone, the fibula of a baboon, [ [http://www.maths.uwa.edu.au/ schultz/3M3/history.html A very brief history of pure… …
13Tally stick — A tally (or tally stick) was an ancient memory aid device to record and document numbers, quantities, or even messages. Tally sticks first appear as notches carved on animal bones, in the Upper Paleolithic. A notable example is the Ishango Bone.… …
14Tram controls — The following article describes the controls on electric, rather than steam trams.OverviewThe operation of trams is relatively simple. As trams run on rails, they do not require steering controls. However they do require controls for the smooth… …
15Compact Cassette — A TDK D C60 cassette, a common speech quality tape with a 60 minute playing time, in a housing similar to that of the original Compact Cassette specification …
16Raised beach — Definition A raised beach or a marine terrace is an emergent coastal landform. Raised beaches and marine terraces are beaches or wave cut platforms raised above the shore line by a relative fall in the sea level. Around the world, the combination …
17Choke (firearms) — In firearms, a choke is a tapered constriction of the gun barrel s bore at the muzzle end, almost always used with shotguns. The purpose is to decrease the spread of the shot in order to gain better range and accuracy.[1] The exit end of the… …
18Conventional PCI — PCI Local Bus Three 5 volt 32 bit PCI expansion slots on a motherboard (PC bracket on left side) …
19Log cabin — For other uses, see Log cabin (disambiguation). Log cabins in the open air Norwegian Museum of Cultural History in Bygdøy, Oslo …
20Cryptanalysis of the Enigma — enabled the western Allies in World War II to read substantial amounts of secret Morse coded radio communications of the Axis powers that had been enciphered using Enigma machines. This yielded military intelligence which, along with that from… …
