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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).
初学者
1 hour
说明
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.
此步骤所需材料：
松木板1 as required所需工具：
手锯
手刨
固定角尺
直尺
铅笔2
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.
此步骤所需材料：
松木板1 as required所需工具：
手锯手刨固定角尺直尺3
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.
此步骤所需材料：
木工胶1 as required
钉子6 个所需工具：
锤子固定角尺直尺此蓝图制作
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