A 'Richards' Improved Patent Steam-Engine Indicator with manufacturers stamp Elliot Bros. London, patent No. 12735, with accessories, instruction label and fitted case with trade plaque McInnes Brothers, Glasgow -- 10.14in. (26cm.) wide; and an oxidised brass roller rule (2)

細節
A 'Richards' Improved Patent Steam-Engine Indicator with manufacturers stamp Elliot Bros. London, patent No. 12735, with accessories, instruction label and fitted case with trade plaque McInnes Brothers, Glasgow -- 10.14in. (26cm.) wide; and an oxidised brass roller rule (2)