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| Title | Steeplejacks |
| Creator (LCNAF) |
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| Publisher | Nottingham: M. Macdonald & Co . |
| Date | 1920 |
| Description | A 51-page booklet published in 1920 called “Steeljacks” by M. Macdonald & Co. (Steeplejacks) Ltd. based out of several Great Britain offices including London, England. Content includes numerous illustrated pages on steeplejacks, chimneys, spires, lightning conductors, and the repair and restoration of towers. |
| Subject.Topical (LCSH) |
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| Subject.Topical (Local) |
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| Subject.Name (LCNAF) |
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| Genre (AAT) |
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| Language | English |
| Type (DCMI) |
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| Original Item Location | T54 .M2 1920 |
| Original Item URL | http://library.uh.edu/record=b5576987~S11 |
| Digital Collection | Architecture Retail Catalog Collection |
| Digital Collection URL | http://digital.lib.uh.edu/collection/aapamphlets |
| Repository | Kenneth Franzheim II Rare Books Room, William R. Jenkins Architecture and Art Library, University of Houston Libraries |
| Repository URL | http://info.lib.uh.edu/about/campus-libraries-collections/william-r-jenkins-architecture-art-library |
| Use and Reproduction | This image is in the public domain and may be used freely. If publishing in print, electronically, or on a website, please cite the item using the citation button. |
| File Name | index.cpd |
| Title | Page 12 |
| Format (IMT) |
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| File Name | aapam_201209_005al.jpg |
| Transcript | velocity. In open country, with the wind forty miles an hour, a 300 feet chimney will swing approximately four to five inches each side of the gravity line, but owing to the thickness of brickwork in the shaft, the momentum is lost over the upper two thirds of its height, that is why, when a chimney is observed to be swinging, no move; ment is felt as a hand is placed on the base. An excellent method to observe movement is to eye the chimney with a plumb corner of another building in close proximity, of course always taking care to discount moving clouds. LIGHTNING CONDUCTORS. When one comes to consider the protection of chimneys and other tall buildings from lightning, it is a matter for individual treatment. There cannot be any stereotyped conductor system for chimneys which differ in height. The subject has to be considered in a scientific light, otherwise danger is unwittingly invited. Let us give an instance. The diameter of a factory chimney top may be 10 feet. It is against every rule to expect that a copper rod and discharge points protruding three or four feet above the top will offer adequate pro; tection, although we have come across many cases where the impossible has been expected. A correctly installed system will perform its proper function, provided the ohmic resistance to earth is kept as low as possible in relation to the soil. So it will be seen that this is another job which should only be allotted to the trained man. A steel chimney is a perfect conductor in itself when correctly earthed. From a long experience, we have devised many new lightning conductor systems. They have the registered trade name of "Mandco" and have been planned for every possible type of building. GENERAL. Our many business friends will, of course, readily understand that to describe fully the entire activities of the numerous specialized branches connected with the Steeplejack profession, such as straightening or felling chimneys, application of mathematical formulas in stresses and strains or the scientific restoration of our priceless cathedrals and churches, would of course require several volumes. Therefore, if any of our readers have at any time a problem they would like to discuss, then the services of our Technical Advisory Department may be, as always, confidently prevailed upon, and of course without charge, for the Macdonald Steeplejack organisation is not unique merely because it is Britain's largest and foremost firm of steeplejacks who specialize in all classes of building work at high altitudes, but by reason of meticulous scientific acumen from the drawing;board stage to the completed contract—and still further—by inspections which are carried out annually, and reports submitted to our clients, which has enabled the sterling quality of a Macdonald contract to be wholly accepted as "worry;proof" by more than 7,joo users of its steeplejack services. |