IṢẸ́ ỌNÀ
ẸWÀ ÀTI ÌLERA
IṢẸ́ ỌWỌ́
ÀṢÀ ÀTI ÌTÀN
ÌṢERÉ
ÀYÍKÁ
OÚNJẸ ÀTI OHUN MÍMU
REVERSE ENGINEERING
SÁYẸ́ǸSÌ
ERÉ ÌDÁRAYÁ
ÌMỌ̀-Ẹ̀RỌ
ÀWỌN OHUN WÍWỌ̀
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).
Olùbẹ̀rẹ̀
1 hour
Ìlànà
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.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Pákó igi pine1 as requiredÀwọn irinṣẹ́ tí a nílò:
Ayùn Ọwọ́
Ohun èlò ìfárí igi (pìlánì)
Igun-òsùwọ̀n tí ó dúró
Ìdíwọ̀n
Gègé2
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.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Pákó igi pine1 as requiredÀwọn irinṣẹ́ tí a nílò:
Ayùn Ọwọ́Ohun èlò ìfárí igi (pìlánì)Igun-òsùwọ̀n tí ó dúróÌdíwọ̀n3
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.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Ìdìpọ̀ Igi1 as required
Ìṣó6 ẹyọÀwọn irinṣẹ́ tí a nílò:
ÒòlùIgun-òsùwọ̀n tí ó dúróÌdíwọ̀nÌtọ́nisọ́nà yìí ń ṣe
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