The firm was founded in London in 1845 by Onorato Comitti as a barometer designer and manufacturer.  In the late 1800s they also started producing clocks.  They continue in business today as a clock manufacturer.

An undated thermometer catalog, probably from the 1890s, is available for download below.  Note that pages 30-39 are out of sequence in the original and in the PDF.  It also has a few barometers in it. (51 pages):

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