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Finger (unit)
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A finger (sometimes fingerbreadth or finger's breadth) is any of several units of measurement that are approximately the width of an adult human finger. [Exactly which part of the finger should be used is not defined; the width at the base of fingernail (#6 in the sketch) is typically less than that at the knuckle (#5).]
The digit, also known as digitus or digitus transversus (Latin), dactyl (Greek) or dactylus, or finger's breadth – 3⁄4 of an inch or 1⁄16 of a foot.[1][2] (about 2 cm)
In medicine and related disciplines (anatomy, radiology, etc.) the fingerbreadth (literally the width of a finger) is an informal but widely used unit of measure.[3][4]
In the measurement of distilled spirits, a finger of whiskey refers to the amount of whiskey that would fill a glass to the level of one finger wrapped around the glass at the bottom.[5][6][7]
Another definition (from Noah Webster): "nearly an inch."[8][9]
Finger is also the name of a longer unit of length, used historically in cloth measurement, to mean one eighth of a yard or 41/2 inches.[8][10] (114.3 mm) Again, which finger and whose finger, is not defined.
These units have no legal status but remain in use for 'rough and ready' comparisons.
See also
[edit]- Digit (unit) ('6' in the diagram above)
- Finger tip unit – Unit of ointment dosage in Medicine
- English units (before 1826)
- Imperial units – System of measurements (from 1826)
- United States customary units – Units of measurement commonly used in the U.S.
References
[edit]- ^ Noah Webster; John Walker (1830). American dictionary of the English language. digit: Converse. p. 247. Retrieved 15 January 2012.
- ^ Ronald Edward Zupko (1985). A dictionary of weights and measures for the British Isles: the Middle Ages to the twentieth century. American Philosophical Society. pp. 109–10. ISBN 978-0-87169-168-2.
- ^ The American Journal of the Medical Sciences. Charles B. Slack. 1839. p. 363. Retrieved 15 January 2012.
- ^ David V. Skinner (28 April 1997). Cambridge textbook of accident and emergency medicine. Cambridge University Press. p. 1209. ISBN 978-0-521-43379-2. Retrieved 15 January 2012.
- ^ University chronicle. 1858. p. 187. Retrieved 15 January 2012.
- ^ Bret Harte (1899). "A Jack and Jill of the Sierras". McClure's magazine. S.S. McClure Co. p. 230.
- ^ Harvard Student Agencies, Inc. The official Harvard Student Agencies bartending course. Macmillan. p. 38. ISBN 978-0-312-25286-1.
- ^ a b Noah Webster (1896). Webster's collegiate dictionary. G. & C. Merriam. p. 332. Retrieved 14 January 2012.
- ^ William Markham (1739). A general introduction to trade and business: or, The young merchant's and tradesman's magazine ... A. Bettesworth and C. Hitch. p. 104.
- ^ The Encyclopedia Americana. Encyclopedia Americana Corp. 1920. p. 165.
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Finger (unit)
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Definition and Origins
Definition
The finger, also known as the fingerbreadth or digit, is a historical unit of length derived from human anatomy, specifically approximating the breadth of an adult human finger.[6] This measure typically refers to the width across the base or middle phalange, serving as a fundamental subdivision in early systems of measurement where body parts provided natural standards.[1] While individual variations exist due to differences in hand size, historical standardizations fixed the finger at approximately 18-20 mm, or 0.7 to 0.8 inches, for consistency in applications like construction and trade.[1] Importantly, the finger unit denotes breadth rather than the full length of a finger, which extends from the base to the tip and measures roughly three to four inches—far longer and not equivalent to larger spans like the handspan.[7] It is also distinct from the thumb's width, which originated the inch as a separate unit of about 25.4 mm.[6] In ancient Egyptian systems, for instance, the finger was standardized as one twenty-eighth of the royal cubit, emphasizing its role as a precise, anatomical baseline for linear measurement.[8]Etymology and Linguistic Roots
The linguistic roots of the finger unit trace back to ancient Indo-European languages, where terms for the anatomical finger were extended to denote a unit of length based on its breadth. In Latin, digitus referred to both a finger or toe and a fundamental measure of length, derived from the Proto-Indo-European root deik- meaning "to show" or "pronounce," reflecting the finger's role in pointing and counting.[9][10] Similarly, in Ancient Greek, the term dáktylos (δάκτυλος), meaning "finger" or "toe," formed the basis for the dáktylos as a unit of measure, often equated with a finger's breadth; its etymology is uncertain but possibly pre-Greek, with potential links to Latin digitus through shared concepts of digital anatomy. The English word "finger" evolved from Old English finger, rooted in Proto-Germanic fingraz (meaning "one of five terminal members of the hand"), and by the late medieval period, it was applied to measurement contexts, as in "fingerbreadth" or "finger's breadth," synonyms emphasizing the unit's width derived from the human digit.[11] In biblical Hebrew, etsba (אֶצְבַּע), literally meaning "finger," was used in scriptural contexts for measurements involving the finger's dimensions, underscoring its anatomical and symbolic significance across ancient texts.[12] Cross-linguistically, parallels abound in body-part nomenclature; for instance, Ancient Egyptian employed ḏbꜥ (often transliterated as djeba), denoting "finger" and serving as a basic linear unit, while Mesopotamian languages like Akkadian used equivalents such as ubānu for "finger," tying the measure directly to human anatomy in cuneiform records.[13]Historical Usage
Ancient Civilizations
In ancient Egypt, the finger unit, known as the dba, served as a fundamental subdivision of the royal cubit (meh neswt), with 28 fingers comprising one cubit of approximately 52.5 cm.[14] This system emerged around 3000 BCE during the Early Dynastic Period and was essential for precise architectural endeavors, including the construction of pyramids such as the Great Pyramid of Giza, where cubit rods marked with finger divisions facilitated alignment and scaling.[14] Additionally, the finger unit contributed to Nile gauging, enabling measurements of annual flood levels to assess arable land and support agricultural planning tied to emmer and barley production.[14] In Mesopotamian and Sumerian societies, the finger (ubanu) functioned as a key subunit of the cubit (ammatu), typically with 30 fingers per cubit of about 50 cm, as evidenced in cuneiform texts from the third millennium BCE.[15] Around 2500 BCE, during the height of Sumerian urbanization in cities like Uruk and Ur, these measurements appeared in administrative records for urban planning, including the layout of temples, ziggurats, and irrigation canals, where finger subdivisions ensured proportional designs in clay tablet plans.[16] This sexagesimal-based system reflected the practical needs of early state bureaucracies in managing land allocation and construction.[17] Biblical Hebrew texts reference the "fingerbreadth" (etzba), portraying it as a subunit in sacred and architectural contexts, such as in Jeremiah 52:21, which describes the bronze pillars of the Temple in Jerusalem as having a thickness of four fingerbreadths within an 18-cubit height.[18] This measurement, drawn from ancient Israelite practices influenced by Near Eastern traditions, underscored the unit's role in temple architecture, symbolizing precision in divine structures during the First Temple period around 1000–586 BCE.[19] Standardization of the finger unit across these ancient Near Eastern civilizations relied on the average breadth of a male finger, typically the index or middle finger, estimated at 1.8–2 cm, with verification against the palm, which equated to four fingers.[20] This anthropometric approach ensured consistency in metrology, as seen in cubit rods and textual descriptions, adapting to regional variations while maintaining utility in both secular and ritual applications.[18]Classical and Medieval Periods
In ancient Greece, the finger unit, known as the daktylos, served as a fundamental subdivision in the system of length measurements, equivalent to approximately 19.25 mm. The Greek foot, or pous, measured about 30.8 cm and consisted of 16 daktyloi, while the cubit, or pechys, spanned roughly 46.2 cm and comprised 24 daktyloi. These units, inherited with modifications from earlier Egyptian models, were integral to architectural design and construction during the Classical period. For instance, the Parthenon's dimensions in the 5th century BCE were proportioned using multiples of the pous and its finger subdivisions, ensuring harmonic scaling in the temple's columns and entablature.[21][22] The Romans adapted the Greek daktylos into the digitus, standardizing it at around 18.5 mm, with 4 digiti forming a palm (palmus) and 16 comprising the foot (pes) of approximately 29.6 cm. This system facilitated precise engineering feats, including military fortifications and aqueducts, where the digitus allowed for fine adjustments in alignment and gradient. Roman surveyors employed bronze standards and tools like the groma to apply these units over vast distances, as evidenced in the construction of aqueducts such as the Aqua Claudia, where channel widths and slopes were calibrated to the pes and its subdivisions.[23][24] During the Medieval period in Europe, the finger unit persisted in Anglo-Saxon and Frankish measurement systems, primarily for land surveying and agricultural demarcation, where it denoted a small linear increment of approximately 1.9 cm (or three-quarters of an inch) for plotting boundaries and furrows. By the 12th century, however, the term "finger" was also used for a larger unit of 4.5 inches (11.4 cm) in textile trade to gauge cloth lengths in markets across England and France. This reflected broader economic changes, with the unit embedded in guild standards for wool and linen.[25][26] In the Islamic Golden Age, particularly under the Abbasid Caliphate from the 8th to 13th centuries, Arabic scholars preserved and refined the finger as a subdivision of the cubit (dhirāʿ), which measured about 48 cm, drawing from Hellenistic and Persian traditions. This system informed engineering texts, such as those on hydraulics and architecture by Al-Jazari, where fingers subdivided cubits for designing waterwheels and mosques, ensuring precision in load-bearing structures and irrigation channels.[20][27]Variations Across Cultures
Short Finger (Fingerbreadth or Digit)
The short finger, commonly referred to as the fingerbreadth or digit, represents an ancient unit of length derived from the anatomical width of the distal phalange of the human index finger. This measurement served as a fundamental standard in various historical systems, approximating 3/4 inch or 19 mm in typical Greek applications.[1] Known by synonyms such as digit (digitus in Latin) or dactyl (daktylos in Greek), the unit exhibited slight cultural variations; for instance, the Roman digitus was standardized at 18.5 mm, while the Egyptian equivalent measured 18.75 mm.[22] Although primarily employed as a base unit in fractional hierarchies—such as 16 digits forming a foot or 28 comprising a cubit—the short finger was occasionally subdivided further, for example, into smaller segments like barley grains in some medieval contexts, though such divisions were not widespread.[1] Historical standards accounted for natural variability in finger breadth due to factors like gender or ethnicity by relying on averaged values from adult males, ensuring consistency across applications; for example, official Roman specifications fixed the digitus at 18.5 mm despite individual differences. The unit played a role in ancient cubit systems, where it formed the smallest subdivision for precise linear measurements.[28]Long Finger (Cloth Measure)
The long finger served as a specialized unit of length in cloth measurement, equivalent to one-eighth of a yard, or 4.5 inches (114.3 mm). This measure emerged in English cloth markets during the 13th century as a practical tool for draping and estimating fabric lengths rapidly, allowing traders to assess bolts without requiring precise instruments. It was particularly suited to the wool trade, where consistent sizing was essential for commerce.[29][30] In medieval European trade practices, the long finger was integrated into guild regulations for determining cloth bolt lengths, promoting uniformity in transactions across markets. With eight long fingers comprising a single yard, the unit simplified mental calculations for merchants handling yardage sales. Standardization efforts, such as those outlined in early statutes like the Magna Carta of 1215, reinforced reliable measures for wool and textiles, indirectly supporting subdivisions like the long finger in English systems.[31][32] The long finger remained in use through the early modern era but gradually declined following the 19th-century push for imperial standardization under acts like the Weights and Measures Act of 1824, which formalized the yard while diminishing smaller traditional units. Full metric adoption in Britain from the 1960s onward further marginalized it, though remnants persisted informally in tailoring for quick fabric assessments into the 20th century.[33]Conversions and Equivalents
Relation to Larger Units
In ancient Egyptian metrology, the finger, or digit, formed the base of a hierarchical system where 4 fingers equaled 1 palm, and 7 palms composed 1 royal cubit measuring approximately 524 mm. This structure enabled modular scaling essential for monumental architecture, such as the precise alignments in pyramid construction and temple surveying.[34] The Greek and Roman systems similarly positioned the digit (daktylos in Greek or digitus in Latin) as the foundational unit, with 4 digits comprising 1 palm (palmē or palmus), 6 palms equaling 1 cubit (pechys or cubitus), and 16 digits corresponding to 1 foot (pous or pes); these relations supported proportional design principles in classical architecture, engineering, and urban planning.[35] In medieval European measurement, particularly for cloth in England, 3 fingers equaled 1 nail, and 8 nails formed 1 quarter-yard (though variations existed, with the full yard comprising 16 nails); this subdivision integrated into broader units like the ell (45 inches for fabric) and the perch (16.5 feet for land), facilitating trade and agrarian divisions.[36] Biblical and Hebrew traditions defined the fingerbreadth (etzba) such that 4 fingerbreadths equaled 1 handbreadth (tefah), serving as a subunit within the cubit (ammah) for sacred dimensions, as evidenced in temple measurements detailed in Ezekiel 40, where a measuring reed of six cubits each extended by one handbreadth underscored the system's precision.[37]Modern Metric and Imperial Equivalents
The short finger, also known as the fingerbreadth or digit, is standardized in modern equivalents as 0.75 inches or 1.905 centimeters (19.05 millimeters).[38] In the context of ancient Roman measurements, the exact digitus equates to approximately 18.5 millimeters, derived from the Roman foot of 296 millimeters divided into 16 parts.[39] The long finger, primarily used as a cloth measure, corresponds to 4.5 inches or 11.43 centimeters (114.3 millimeters).[38] These values translate to metric conversions of approximately 0.01905 meters for the short finger and 0.1143 meters for the long finger.[38] Due to variations in historical applications, these figures represent averages; contemporary archaeological recreations and replicas often standardize the short finger at 19 millimeters for consistency in replication efforts.[40]| Variant | Imperial (inches) | Metric (cm) | Metric (mm) | Metric (m) |
|---|---|---|---|---|
| Short finger/digit | 0.75 | 1.905 | 19.05 | ≈0.01905 |
| Roman digitus | ≈0.728 | 1.85 | 18.5 | ≈0.0185 |
| Long cloth finger | 4.5 | 11.43 | 114.3 | 0.1143 |