The clerks were employed under the various officers, military and civil, of the Executive Committee; the draughtsmen, partly under Sir W. Cubitt and Mr. M. Digby Wyatt, when they found such assistance necessary in the superintendence and record of the progress of the building; but principally under the Executive Committee, in making the numerous plans which were necessary during the preliminary arrangements. It was from their surveys and drawings that the plans in the Commissioners’ First Report were made. The men employed as clerks and draughtsmen varied at different times from three to forty in number. One of the men, lance-corporal John Pendered, was also employed in working an autographic press, which was useful when a few circulars were required at a short notice. The facility with which he acquired a knowledge of the apparatus was creditable to his aptitude, and the simple method he adopted to throw off the copies with rapidity and clearness proved him to be intelligent and skilful. The most distinguished of the draughtsmen were lance-corporals James Mack, Thomas Baker, and Nicholas Clabby, corporal Archibald Gardner, and lance-corporals Richard R. Lindsay and John Venner. The large plans, both of the ground and galleries, made for the convenience of the visitors, to enable them to find their way more easily to the parts likely most to engage their curiosity, and which were displayed at the south side of the transept during the later months of the Exhibition, were prepared by corporals Mack, Baker, Gardner, and Gabby. Both were considered to be highly-creditable specimens of drawing, combining boldness and skill with perspicuity. A daily journal, after noticing one of the drawings, thus wrote of the sappers, “Indeed that body have rendered invaluable services, not only in the general arrangements of the interior, but more especially in making those nice measurements which were essential with reference to the question of space.” It then concluded its notice by making some flattering allusions to the proficiency of the sappers employed on the national surveys.[72] The plans were each twenty-one feet long by six feet wide. Similar drawings on a very reduced scale, from which the plans in the first report were engraved, were executed by corporals Gardner, Mack, Clabby, Venner, and Lindsay, but the principal and most effective part of the work devolved on corporal Mack. The ground plan was drawn by the three first-named non-commissioned officers, and the galleries by corporals Mack and Venner. The interesting coloured diagram to show the fluctuations in the number of visitors, and other characteristic details, was wholly drawn by corporal Mack. The plan of the exhibition building to illustrate the water-supply, and measures for security against fire, was drawn by corporal Lindsay. These four drawings comprised the plans in the First Report.