Moving-iron a.c. recording voltmeter no.71159, with dashpot oil and inks, made in England by Elliott Bros (London) Ltd, 1950-1969. Speed 1 inch per hour, range 180V to 260V(lacks pen) Moving-iron a.c. recording voltmeter no.71159 1950-1969
Colour photograph by Peter Mitchell: 'Herbalist, Mrs McArthy & Daughter, Sangley Road, London, 1975', printed 2010. 'Herbalist, Mrs McArthy & Daughter, Sangley Road, London, 1975' 1975 (photograph); 2010 (print)