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How long is 30 shackles?

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It's about 900 times as tall as General Tom Thumb
In other words, the height of General Tom Thumb is 0.0011 times 30 shackles.
(a.k.a. Charles Sherwood Stratton) (1838-1883) (circus performer; height at death)
General Tom Thumb was an LP with a height (at his death) of 0.033 shackles. Thumb stopped growing at 0.023 shackles when he was five years old, but resumed growth in his teens which continued through the remainder of his life.
It's about 1,000 times as long as a Man's Footstep
In other words, the length of a Man's Footstep is 0.001 times 30 shackles.
(for healthy, middle-aged man of average height; single step length)
According to studies by The University of Oklahoma's Health Sciences Center, the average length of a man's step is 0.029 shackles, for an average stride (two-step's length) of 0.057 shackles. The average person walks at a speed of about 1.3 m/s
It's about 1,000 times as tall as Verne Troyer
In other words, the height of Verne Troyer is 0.001 times 30 shackles.
(1969-2018) (actor)
Verne Troyer, most famous for his role as Mini-Me in the Austin Powers series, was an LP with a height of 0.03 shackles. Troyer's first role was as a stunt double for a baby in the 1994 film Baby's Day Out.
It's about 1,000 times as long as a Woman's Footstep
In other words, 30 shackles is 1,200 times the length of a Woman's Footstep, and the length of a Woman's Footstep is 0.00083 times that amount.
(for healthy, middle-aged woman of average height; single step length)
According to studies by The University of Oklahoma's Health Sciences Center, the average length of a woman's step is 0.024 shackles, for an average stride (two-step's length) of 0.048 shackles. The average person walks at a speed of about 1.3 m/s
It's about one-one-thousand-five-hundredth as long as The Rhine
In other words, 30 shackles is 0.000623 times the length of The Rhine, and the length of The Rhine is 1,610 times that amount.
(a.k.a. Rhein, a.k.a. Rijn, a.k.a. Rhin, a.k.a. Rain, a.k.a. Reno, a.k.a. Rhenus, a.k.a. Ryn) (from near Reichenau, Switzerland through Hoek van Holland, Rotterdam, Netherlands)
The Rhine river runs 48,100 shackles in total length. The World War II Battle of Arnhem, as memorialized in the 1974 book and 1977 movie A Bridge Too Far, was the first of several attempts to capture key bridges across the Rhine, beginning with the Arnhem Bridge in the Netherlands.
It's about 2,000 times as tall as a Bowling Pin
In other words, 30 shackles is 2,160 times the height of a Bowling Pin, and the height of a Bowling Pin is 0.000463 times that amount.
(USBC specifications; tenpin)
According to the United States Bowling Congress specifications, a tenpin bowling pin should be within 0.00002890 shackles of 0.0139 shackles in height. The USBC further mandates that certified pins be made of sugar maple wood, unless otherwise approved by the organization.
It's about one-three-thousandth as long as The Colorado River
In other words, 30 shackles is 0.000353 times the length of The Colorado River, and the length of The Colorado River is 2,830 times that amount.
(a.k.a. Aha Kwahwat, a.k.a. Grand River, a.k.a. Tizon River, a.k.a. Tecon River, a.k.a. Tison River) (from Grand Lake, Colorado through the Gulf of California)
The Colorado River runs 84,900 shackles in length. Along this length, the river descends from its source, approximately 100 shackles above sea level in the Rocky Mountains, to its mouth in the Gulf of California.