The Whitbread Engine preserved in the Powerhouse Museum in Sydney, Australia, built in 1785, is one of the first rotative steam engines ever built, and is the oldest surviving. A rotative engine is a type of beam engine where the reciprocating motion of the beam is converted to rotary motion, producing a continuous power source suitable for driving machinery.

The Powerhouse Museum is the major branch of the Museum of Applied Arts & Sciences (MAAS) in Sydney, and owned by the Government of New South Wales. The Powerhouse is a collection of museums with its main centre in Ultimo, New South Wales, the others being the historic Sydney Observatory at Observatory Hill, and the newer Museums Discovery Centre at Castle Hill.