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Boning Rods: Three Identical T-Rods, 3 ft × 3 in × ½ in, Baker 1919
Boning rods are three identical T-shaped rods for setting out a level line or an even fall by eye. Paviors used them, and drainers found them indispensable. This is the size given in Baker's surveying textbook: 3 feet long, 3 inches wide, ½ inch thick, with a cross head about 6 inches long. Drainers usually made them longer.
Source: T. Baker and F. E. Dixon, Land and Engineering Surveying, 23rd ed., Crosby Lockwood, London 1919, p. 106. The cross head's section, the fixing and the tools are ours. The picture shows boning rods set out for field drains (Alan Murray-Rust, CC BY-SA 2.0).
Baguhan
1 hour
Mga Tagubilin
1
1
Cut three equal rods
Cut three equal rods
Saw three rods 3 ft (914 mm) long from board 3 in (76 mm) wide and ½ in (13 mm) thick. They must be exactly alike: square the ends and plane them to the same length. For drains, make them longer, all to the same length.
Mga materyales para sa hakbang na ito:
Tablang pino1 as requiredMga kailangang kasangkapan:
Lagaring Pangkamay
Katam
Eskuwalang de-tokod
Ruler
Lapis2
2
Cut three cross heads
Cut three cross heads
Cut three cross heads about 6 in (152 mm) long. Ours: from the same board, with square, straight top edges.
Mga materyales para sa hakbang na ito:
Tablang pino1 as requiredMga kailangang kasangkapan:
Lagaring PangkamayKatamEskuwalang de-tokodRuler3
3
Fix the heads square
Fix the heads square
Fix each head across the top end of a rod, centred and square to it, to make a T. Ours: glue and two nails. Check that the three rods stand exactly the same height to the top of the head.
Mga materyales para sa hakbang na ito:
Pandikit sa Kahoy1 as required
Mga pako6 pirasoMga kailangang kasangkapan:
MartilyoEskuwalang de-tokodRulerMga Materyales
3- 1 as requiredPlaceholder
- 1 as requiredPlaceholder
- 6 pirasoPlaceholder
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