Smoot

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For other uses, see Smoot (disambiguation).
1 smoot =
International units
1.702 m 1.702×10−3 km
1701.8 mm 17.018×109 Å
11.376×10−12 AU 179.88×10−18 LY
US customary / Imperial units
67 in 5.583 ft
1.861 yd 1.057×10−3 mi


The smoot is a nonstandard unit of length created as part of an MIT fraternity prank. It is named after an MIT fraternity pledge to Lambda Chi Alpha, Oliver R. Smoot (class of 1962), who in October, 1958 was rolled head over heels by his fraternity brothers to measure the length of the Harvard Bridge between Boston and Cambridge, Massachusetts. One smoot is equal to his height (five feet and seven inches -- 1.70 m), and the bridge's length was measured to be "364.4 smoots plus one ear". Everyone walking across the bridge today sees painted markings indicating how many smoots they are from the Boston-side river bank. The marks are repainted each year by the incoming associate member class (similar to pledge class) of Lambda Chi Alpha.

Markings typically appear every 10 smoots, but additional marks appear at other numbers in between. For example, the 70-smoot mark is omitted in favor of a mark for 69. The 182.2-smoot mark is accompanied by the words "Halfway to Hell" and an arrow pointing towards MIT. Each class also paints a special mark for their graduating year.

View from the Boston side of the Harvard Bridge, looking towards MIT. The 260 smoot mark can be seen here.
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View from the Boston side of the Harvard Bridge, looking towards MIT. The 260 smoot mark can be seen here.

The markings have become well-accepted by the public, to the point that during the bridge renovations that occurred in the 1980s, the Cambridge Police department requested that the markings be maintained, since they had become useful for identifying the location of accidents on the bridge. [1] The renovations went one better, by scoring the sidewalk on the bridge at 5 feet and 7 inch intervals, instead of the conventional six feet.[2]

Google Calculator also incorporates smoots. Enter 10 feet in smoots at Google and the calculator will respond that 10 feet is 1.79104478 smoots. Google also uses the smoot as an optional unit of measurement in their Google Earth software.

Oliver Smoot later became Chairman of the American National Standards Institute (ANSI)[3] and President of the International Organization for Standardization (ISO).[4]

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