Historical information

For an explanation about the history of steam engine indicators, visit:
http://www.archivingindustry.com/Indicator/contentback.htm [last viewed 20 May 2013].

For information about the Richards' Improved Patent Steam-Engine Indicator see John Walter's publication 'The Engine Indicator: a short history of the autographic patterns from 1800 to the present day' - available online via:
http://www.archivingindustry.com/Indicator/chaptertwo.pdf
Information on Casartelli, Manchester is also available online via:
http://www.archivingindustry.com/Indicator/chapterfour.pdf
Refer pp.21-22 [last viewed 20 May 2013]

Physical description

Brass steam-engine indicator 125mm tall - accompanied by four steel piston springs - and a wooden measuring rule

Inscriptions & markings

Indicator [a] Casartelli Manchester [b] 41 ;
Ruler [a] 12 to the Inch [b] No.2 [c] Casartelli & Son Manchester