This rare plumb bob was used for surveying in mines. The hollow body would be filled with fuel and the wick would be lighted. Then the surveyor could sight on the flame. It is in excellent condition retaining most of the original anodized finish. The body is 4 1/4 tall by 1 7/8 in diameter. The gimbal ring is 3 in diameter. The original chains and hanging hook are approx. 39 long. The case is 3 5/8 square by 6 5/8 tall. It is in solid condition but most of the carrying strap is missing--only the parts that were fastened to the case remain. The plate on the front is from the Hughes Owens Co., a retailer of surveying instruments with stores in the larger Canadian cities.''
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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