The nineteenth century’s bicycle craze included bicycles for two. Some gave pals (both male) an opportunity for sport, exercise, and freedom. Others were leveraged for courtship and time alone with a man’s best gal. Some were truly tandem (situated one in front of the other). Others allowed the lady to pedal while others simply sat her in a place of prominence allowing her a view of the road ahead. And some existed for a brief period of time until the next great thing came along.
The tandem bicycle or twin is a form of bicycle (occasionally a tricycle) designed to be ridden by more than one person. The term tandem refers to the seating arrangement (fore to aft, not side by side), not the number of riders. A bike with two riders side by side is called a sociable. [source] (bold added for emphasis).
Apparently, that’s what “velocipede” means: A bicycle without a chain:
The Sociable or Buddy Bike or Side By Side Bicycle is a bicycle that supports two riders who sit side by side. This type of bicycle should not be confused with a tandem bicycle, where the riders sit fore and aft rather than beside each other.
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…The sociable is said by some to have been invented by Australian cyclist Hubert Opperman, although in its basic form it has been around for longer, since the end of the 19th century. It was originally marketed by the Punnett Cycle Company. Historically it has been used as a courting bike; gentlemen would be able to spend time with young ladies in an activity that allowed proximity.
No matter how adverse to wheeling a woman may be, if by any means she can be coaxed to the front seat of a tandem and giving a spin over a good road, her conversion is a forgone conclusion. (The Ladies’ World, June 1897). ~ Quoted in Manners and Morals of Victorian America by Wayne Erbsen, page 13.
Note that this first patent (1888, in first two images) shows a seat in front for a non-steering passenger (in two views). Two sets of pedals, only one steering shaft. Second (front) handlebars are for balance only.
The following two examples from inventors Hall and Starley most closely resemble the bicycle my hero Chadwick “C.C.” Hughes built for his bride, Sophia Sorensen from two commercially available bicycles. He already knew of her love for her bicycle, the flack she’d received from the local newspaperman for riding her bicycle even after winter set in, and Chad knew she’d love it. This bicycle meant a great deal to him–and he knew it would mean a great deal to her. First and foremost, a sign of his desire to spend more time with her. The price tag, alone, showed just how much he wanted to make their courtship permanent. What book is this? Sophia’s Leap-Year Courtship.