It was Antonio Stradivari (1644-1737) who developed the cello size that we know today. ... The history of the cello records that designs continued to evolve only minutely during the late 1800's and early 1900's. The most noticeable change being the end pin rod (spike), which was included to make it easier to balance.

How the cello changed over time?

The earliest cellos were developed during the 16th century and frequently were made with five strings. ... Only during the 17th and 18th centuries did the cello replace the bass viola da gamba as a solo instrument. During the 17th century the combination of cello and harpsichord for basso continuo parts became standard.

What instrument did the cello evolve from?

This family evolved from the viola da braccio, an instrument that was held aloft in the arm, played with a bow and bore a strong resemblance to today's violin. The new violin family had instruments all along the range from bass to soprano voice.