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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).
Mwanzo
1 hour
Maagizo
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.
Vifaa kwa hatua hii:
Ubao wa msonobari1 as requiredZana zinazohitajika:
Msumeno wa mkono
Randa ya mkono
Kipima pembe cha nyuzi tisini
Rula
Penseli2
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.
Vifaa kwa hatua hii:
Ubao wa msonobari1 as requiredZana zinazohitajika:
Msumeno wa mkonoRanda ya mkonoKipima pembe cha nyuzi tisiniRula3
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.
Vifaa kwa hatua hii:
Gundi ya Mbao1 as required
Misumari6 vipandeZana zinazohitajika:
NyundoKipima pembe cha nyuzi tisiniRulaVifaa
3- 1 as requiredKishikilia Nafasi
- 1 as requiredKishikilia Nafasi
- 6 vipandeKishikilia Nafasi
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