A bit more here........
http://www.mosi.org.uk/media/33871458/theronchettifamily.pdfJohn Baptist and Joshua Ronchetti "John Baptist and Joshua Ronchetti, and probably Elizabeth, acquired a thriving business
in Market Street, trading as opticians, barometer makers, and philosophical and
mathematical instrument makers. However, at the end of the 1840s, John Baptist went to
London and set up a business trading as Ronchetti Brothers, hydrometer and
thermometer makers, at 13, Fleet Street.
In 1851, the Manchester instrument-making firm was sold to Joseph Casartelli following
his marriage to Joshua's sister Harriet. Joshua and Elizabeth then worked with their father
in the chemical business and took over when he emigrated. However, a few years later,
they also moved, probably to London, and sold that business to Joseph Casartelli. The
firm of Joseph Casartelli & Son became very successful and traded until the 1960s."