The Universal Mining Code for the use of mining companies, mining engineers ... The Code words specially selected to comply with the Telegraph Convention rules, by G. Ager
A telegraphic code book issued by its authors in 1890 for mining companies, engineers and agents cabling abroad under Telegraph Convention rules, its pages interleaved with trade advertisements from British engineering firms. The plates are wood-engraved and line-block views of winding gear, boilers, electric coal cutters and rock drills, shown in three-quarter elevation with maker's names cast on the bedplates, plus ruled advertisement borders and heavy display lettering.
