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A fishing sinker or plummet is a weight used in conjunction with a fishing lure or hook to increase its rate of sink, anchoring ability, and/or casting distance. Fishing sinkers may be as small as 1 gram (0.035 oz) for applications in shallow water, and even smaller for fly fishing applications, or as large as several pounds (>1 kg) or ...
File:Andrew Loomis, Figure Drawing for All It's Worth.pdf. Size of this JPG preview of this PDF file: 474 × 599 pixels. Other resolutions: 190 × 240 pixels | 380 × 480 pixels | 607 × 768 pixels | 810 × 1,024 pixels | 1,870 × 2,364 pixels. This is a file from the Wikimedia Commons. Information from its description page there is shown below.
A diagram of a typical nautical sextant, a tool used in celestial navigation to measure the angle between two objects viewed by means of its optical sight. Celestial navigation, also known as astronavigation, is the practice of position fixing using stars and other celestial bodies that enables a navigator to accurately determine their actual current physical position in space or on the ...
Origins of Babylonian mathematics. Babylonian mathematics is a range of numeric and more advanced mathematical practices in the ancient Near East, written in cuneiform script. Study has historically focused on the Old Babylonian period in the early second millennium BC due to the wealth of data available.
Abacus. An abacus ( pl.: abaci or abacuses ), also called a counting frame, is a hand -operated calculating tool which was used from ancient times in the ancient Near East, Europe, China, and Russia, until the adoption of the Arabic numeral system. [ 1] An abacus consists of a two-dimensional array of slidable beads (or similar objects).
Antikythera wreck. The Antikythera wreck ( Greek: ναυάγιο των Αντικυθήρων, romanized : navágio ton Antikythíron) is a Roman-era shipwreck dating from the second quarter of the first century BC. [ 1][ 2] It was discovered by sponge divers off Point Glyphadia on the Greek island of Antikythera in 1900.
dummies .com. For Dummies is an extensive series of instructional reference books which are intended to present non-intimidating guides for readers new to the various topics covered. The series has been a worldwide success with editions in numerous languages. The books are an example of a media franchise, consistently sporting a distinctive ...
The Antikythera mechanism (/ ˌ æ n t ɪ k ɪ ˈ θ ɪər ə / AN-tik-ih-THEER-ə, US also / ˌ æ n t aɪ k ɪ ˈ-/ AN-ty-kih-) [1] [2] is an Ancient Greek hand-powered orrery (model of the Solar System), described as [weasel words] the oldest known example of an analogue computer [3] [4] [5] used to predict astronomical positions and eclipses decades in advance.