Adjusting a Plumb-Bob Line
When plumbing a piece of work, if there is no help at hand to hold the overhead line, it is common practice to fasten the plumb line to a nail or other suitable projection. On coming down to the lower floor it is often found that the bob has been secured either too high or too low. When fastening the line give it plenty of slack and when the lower floor is reached make a double loop in the line, as shown in the sketch. Tightening up on the parts AA will bind the loop bight B, and an adjustable friction-held loop, C, will be had for adjusting the bob accurately either up or down.
Contributed by Chas. Herrman, New York City.