W. and J. H. Johnson
From Graces Guide
Presumably the partnership of William and John Henry Johnson
1856 Exhibited drawings of important inventions, including Chamberlain's Brick Tube and Tile Machine; Mr. M'Connell's improved Locomotive; Wilson's Balanced Valve Steam Hammer; a some of several lathes, shaping and shearing machines by Sharp, Stewart, and Co.; also a drawing of the Bowling Iron Company's Steam-hammer.
1858 Exhibited a drawing of the retorts invented by Mr. W. Bragge, and used in the Buenos Ayres Gas Works, fitted up by E. T. Belhouse and Co., Manchester.
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