 | Mines and mineral resources - 1883 - 586 pages
...Where iron is used for the rod, a galvanized-iron plate of similar dimensions should be employed. 14. Inspection. — Before giving his final certificate,...causes, and often from the carelessness of workmen. 15. Collieries. — Undoubted evidence exists of the explosion of firedamps in collieries, through... | |
 | Agriculture - 1906 - 1580 pages
...pipe. The resistance of a tubular earth on this plan should be very low and practically constant. 27. INSPECTION. — Before giving his final certificate...of the works from accidental causes, and often from carelessness of workmen. 28. Inspection may be considered under two heads: A. The conductor itself.... | |
 | Robert Henry Scott - Meteorology - 1885 - 458 pages
...— and be soldered to it; or a tape may be soldered to a sheet of copper 3 feet x 3 feet and i inch thick, buried in permanently wet earth, and surrounded...causes, and often from the carelessness of workmen. where lie was standing, quite clearly, when flashes appeared in the direction in which they lay. Thunderstorms... | |
 | Royal Society of Victoria (Melbourne, Vic.) - Science - 1886 - 402 pages
...Where iron is used for the rod a galvanised iron plate of similar dimensions should be employed. 14. INSPECTION. — Before giving his final certificate,...causes, and often from the carelessness of workmen. 15. COLLIERIES. — Undoubted evidence exists of the explosion of firedamp in collieries, through sparks... | |
 | Daniel Kinnear Clark - Mechanical engineering - 1892 - 682 pages
...used for the rod. a galvanized iron plate of similar dimensions should be employed. Tntpection. — Before giving his final certificate, the architect...causes, and often from the carelessness of workmen. Collieries. — Undoubted evidence exists of the explosion of fire-damp in collieries through sparks... | |
 | E. Spon - Building - 1896 - 504 pages
...taking care that the surfaces of the copper are, as in the previous oases, not less than IS square feet. Inspection. — Before giving his final certificate,...causes, and often from the carelessness of workmen. Collieries. — Undoubted evidence exists of the explosion of firedamp in collieries through the sparks... | |
 | Killingworth Hedges - Lightning-conductors - 1905 - 156 pages
...The resistance of a tubular earth on this plan should be very low and practically constant. (13.)— INSPECTION. Before giving his final certificate the...latest period of the works from accidental causes, and of ten from the carelessness of workmen. Inspection may be considered under two heads : — A. The... | |
 | Killingworth Hedges - Lightning-conductors - 1905 - 156 pages
...The resistance of a tubular earth on this plan should be very low and practically constant. (13.)— INSPECTION. Before giving his final certificate the...latest period of the works from accidental causes, and of ten from the carelessness of workmen. Inspection may be considered under two heads : — A. The... | |
 | Meteorology, Agricultural - 1906 - 388 pages
...pipe. The resistance of a tubular earth on this plan should be very low and practically constant. 27. INSPECTION. — Before giving his final certificate...of the works from accidental causes, and often from carelessness of workmen. 28. Inspection may be considered under two heads : A. The conductor itself.... | |
 | Alfred Judson Henry - Lightning conductors - 1906 - 28 pages
...The resistance of a tubular earth on this plan should be very low and practically constant. 16 27. INSPECTION.— Before giving his final certificate...of the works from accidental causes, and often from carelessness of workmen. 28. Inspection may be considered under two heads : A. The conductor itself.... | |
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INSPECTION. — Before giving his final certificate the architect should have the conductor satisfactorily examined and tested by a qualified person, as injury to it often occurs up to the latest period of the works from accidental causes, and often from... 
