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Types of epidural needles include: [3] The Crawford Needle; The Tuohy Needle; The Hustead Needle; The Weiss Needle; The Sprotte Spezial Needle; Other Epidural Needles : Other less popular types are the Wagner needle (1957), the Cheng needle(1958), the Crawley needle (1968), the Foldes needle (1973), and the Bell needle (1975)—all variants of the Huber design with a blunted tip of varying ...
The French National Print Office adopted a point of 2 ⁄ 5 mm or 0.400 mm in about 1810 and continues to use this measurement today (though "recalibrated" to 0.398 77 mm). [ 21 ] [ 22 ] [ 23 ] Japanese [ 24 ] and German [ 9 ] [ 16 ] [ 18 ] standardization bodies instead opted for a metric typographic base measure of exactly 1 ⁄ 4 mm or 0.250 ...
The traditional typographic units are based either on non-metric units, or on odd multiples (such as 35 ⁄ 83) of a metric unit.There are no specifically metric units for this particular purpose, although there is a DIN standard sometimes used in German publishing, which measures type sizes in multiples of 0.25 mm, and proponents of the metrication of typography generally recommend the use of ...
The Didot point was metrically redefined as 1 ⁄ 2660 m (≈ 0.376 mm) [citation needed] in 1879 by Berthold. The advent and success of desktop publishing (DTP) software and word processors for office use, coming mostly from the non-metric United States , side stepped this metrication process in typography.
Illustration of a typometer. The upper edge is marked with millimeters, half centimeters and centimeters; the lower edge is marked with a typographic point scale in groups of three, six and twelve points (one quarter cicero, half a cicero and one cicero) Front and back of an old metal typometer with a hook for manual type setting Plastic typometers, from the 1980s, with different scales
Text (produced by an ISO stencil template for use with the technical pens) of 5 mm in height has a stroke or line thickness of 0.5 mm, and so requires a brown-nibbed 0.5 mm pen. If this text were used in an ISO-sized document (e.g. A0), and the document were reproduced at half its original height (A2), the text would be rendered 2.5 mm high ...
Point Metric size American system Continental system Chinese system American [4] British [1] French [5] German [6] Dutch Character Pinyin Meaning 1 ≈ 0.353 mm: American [a] ...
Needles with their size in mm. In the UK, the metric system is used. Previously, needles 'numbers' were the Standard Wire Gauge designation of the wire from which metal needles were made. The origin of the numbering system is uncertain but it is thought that needle numbers were based on the number of increasingly fine dies that the wire had to ...