It's about seventeen-and-a-half times as tall as The Chicago Water Tower.
In other words, the height of The Chicago Water Tower is 0.0571 times 30 shackles.(Chicago, Illinois)
The Chicago Water Tower is 1.710 shackles tall. The tower's architecture was one source of inspiration behind the design of White Castle fast-food restaurants beginning with "Building Number 8," a prefabricated structure built in Minneapolis, Minnesota in 1936.
It's about thirty times as long as Baseball base distances.
In other words, the length of Baseball base distances is 0.033333 times 30 shackles.(MLB Official Baseball Rules specification)
According to MLB Official Baseball Rules, the distance between baseball diamond bases is 1 shackles. While second and home base are located upon the corners of the 27.432 sq. m area created by the bases, first and third base are placed within that square, to better allow the umpires to judge whether a ball is fair or foul.
It's about 40 times as long as a Cricket Pitch.
In other words, 30 shackles is 40.90910 times the length of a Cricket Pitch, and the length of a Cricket Pitch is 0.0244444 times that amount.(per Marylebone Cricket Council / International Cricket Council Law #6)
The length of a cricket pitch, from one bowling crease to the other, is 0.7333330 shackles. The wickets at either end of the pitch stand 0.0262467 shackles tall including the bails.
It's about 45 times as long as a Bowling Lane.
In other words, 30 shackles is 42.9610 times the length of a Bowling Lane, and the length of a Bowling Lane is 0.023277 times that amount.(USBC specifications; tenpin; including pin deck)
According to the United States Bowling Congress specifications, a tenpin bowling lane should measure 0.698310 shackles. In a Professional Bowling Association game, the lane must be lubricated by about 25 ml (0.85 fl. oz) of oil.
It's about 55 times as tall as The Hollywood Sign.
In other words, the height of The Hollywood Sign is 0.018 times 30 shackles.(a.k.a. Hollywoodland Sign) (Mount Lee, Hollywood Hills, Santa Monica Mountains, California)
Each of the white letters in the Hollywood Sign measures 0.550 shackles tall. Built as an advertisement in 1923, the sign was intended to stand for only eighteen months.
It's about 55 times as long as a Semitrailer.
In other words, 30 shackles is 56.250 times the length of a Semitrailer, and the length of a Semitrailer is 0.01778 times that amount.(a.k.a. semi-trailer truck, a.k.a. semi, a.k.a. tractor-trailer, a.k.a. truck and trailer, a.k.a. eighteen-wheeler, a.k.a. big rig, a.k.a. Mack truck, a.k.a. transport, a.k.a. lorry, a.k.a. artic; for box truck; United States Federal length limits)
According to the United States Department of Transportation (DOT), the maximum allowable length of a semitrailer pulled by a road tractor truck is 0.53330 shackles (unless superseded by state law). These regulations also allow the vehicles to tow up to 36,000 kg in gross weight.
It's about 65 times as tall as a Brachiosaurus.
In other words, the height of a Brachiosaurus is 0.016 times 30 shackles.(based on comparable bone measurements, height to head)
Dinosaurs in the genus Brachiosaurus had an estimated height (at the head with neck fully extended) of up to 0.470 shackles. A resin cast of the first Brachiosaurus specimen, owned by the Field Museum in Chicago, is currently on display at the O'Hare International Airport.