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1990-01-01 Bridges are a part of the transportation system of a region. They are used to span an obstacle like a stream or chasm. Bridges make the system more efficient either by saving travel distance or by enabling vehicles or pedestrians to reach places that were previously inaccessible. There are four...
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1965-01-01 Concrete is a strong and inexpensive construction material when it is properly prepared and used. This introduction explains the importance of a good mixture and describes the materials used in the mixture. Following this are entries on: Calculating amounts of materials for concrete Mixing...
- 1981-01-01 This prefabricated greenhouse can be added to the south side of an existing house for under $225.
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1990-01-01 The majority of farmers in the world still practise some form of subsistence farming. Their draught-animal and handwork-based farming practices, however, cannot be compared with the completely mechanised and highly automated precision-farming practices that are becoming the norm for many of their...
- 这也有其他语言版本:
- English (en)
- Français (fr)
- Português (pt)
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1981-01-01 A thorough, step-by-step book of basic carpentry projects and techniques that helps readers save money while improving their homes.Projects include everything from installing crown molding to hanging a door.Full-color illustrations show every project step so readers quickly grasp the...
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1980-01-01 This guide describes how to construct a transportable charcoal kiln. The kiln is made from sheet metal and can be built in a workshop by local craftsmen with a resaonable skill level. 20 pages, illustrations
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Will Eaves designed beds, trolleys, wheelchairs and other equipment made from wood, metal tubing and wheels taken from scrap heaps. His plans and designs as well as other developed by health care workers in various parts of the world have now been brought together in the book compiled by Roger...
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Floor plans, drawings, specifications, and descriptions are provided for efficiently and ecologically designed family houses, studio livingspaces, hillside homes, and underground and passive solar-tempered houses. 316 pgs, illustrations, pictures
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Health care practitioners, planners and artisans will find ideas and designs for equipment that can be made locally in relatively small workshops. Alternative materials and fabrication methods are described to meet differing local circumstances.
- 1983-01-01 Complete instructions for building each pump are included in the manual, with detailed drawings to guide construction. Operating and maintenance directions are also given. Efficiency comparisons enable the user to choose the best design for a particular situation. Readers who may be using this...