Speed of a Trotting Horse

This question is asked a lot by writers of historical fiction.

From Hougtalings Handbook of Useful Information ©1889

The following table shows the distance a Horse goes each second at various rates of speed, from 2.20 to 4 minutes:
At a 2.20 gait a horse travels. . . . . . . . . 37 5-7 feet per second
At a 2.25 gait a horse travels. . . . . . . . . 36 1/2 feet per second
At a 2.30 gait a horse travels. . . . . . . . . 35 1-5 feet per second
At a 2.35 gait a horse travels. . . . . . . . . 34 1-16 ft. per second
At a 2.40 gait a horse travels. . . . . . . . . 33 feet per second
At a 2.45 gait a horse travels. . . . . . . . . 32 feet per second
At a 2.50 gait a horse travels. . . . . . . . . 31 1-17 feet per second
At a 2.55 gait a horse travels. . . . . . . . . 30 1-6 feet per second
At a 3.00 gait a horse travels. . . . . . . . . 29 1/3 feet per second
At a 3.10 gait a horse travels. . . . . . . . . 327 3/4 feet per second
At a 3.20 gait a horse travels. . . . . . . . . 26 2-5 feet per second
At a 3.30 gait a horse travels. . . . . . . . . 25 1-7 feet per second
At a 3.40 gait a horse travels. . . . . . . . . 24 feet per second
At a 3.50 gait a horse travels. . . . . . . . . 23 feet per second
At a 4.00 gait a horse travels. . . . . . . . . 22 feet per second