cover image: Public Works Department. Appendices A-H to Standard Specifications in the Madras Presidency

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Public Works Department. Appendices A-H to Standard Specifications in the Madras Presidency

1896

*The more any object projects above the general level the less is the distance between it and the cloud and as the less the distance the less the resistance offered to the discharge high objects are cceteris paribus most frequently struck. [...] The decision as to the best form of points is complicated by two opposing requirements (1) the sharper the point the more rapid the silent discharge of electricity and therefore the more effective the conductor ; but (2) the sharper the point the more easily is it destroyed by oxidation or fused should a heavy disruptive discharge fall upon it. [...] Preece Appendix F p. (137) he arrives at the conclusion that A lightning rod protects a conic space whose height is the length of the rod whose base is a circle having its radius equal to the height of the rod and whose side is the quadrant of a circle whose radius is equal to the height of the rod." At present we have not sufficient data to enable us theoretically to calculate the space [...] It is a very good plan to make the conductor bifurcate close below the surface of the ground and adopt two of the following methods for securing the escape of the lightning into the earth. [...] and if possible the bottom of the hole should never descend below the level of the face of the rock.
government politics public policy
Pages
88
Published in
India
SARF Document ID
sarf.140990
Segment Pages Author Actions
Frontmatter
i-ii unknown view
Standakd Specifications. Lightning Rod Confeeence
1-16 unknown view
Standard Specifications. Sanitation of Working Paeties
17-22 unknown view
Standard Specifications. Instruotions for Using Dymmlte
23-28 unknown view
Standard Specifications.Cements
29-56 unknown view
Standard Specifications. Portland Cement of Indian Manufacture
57-60 unknown view
Standard Specifications. Useful Timber Trees
61-78 unknown view
Standard Specifications. Eules for The Consteuction and Measueement of Doors and Windows
79-82 unknown view
Standard Specifications. Ceramic Mosaic
83-86 unknown view