The Civil engineer and architect's journal, scientific and railway gazette . 0 3 800 t?! 3 030 37,000 2,400 21,245 560 24,000 500 PLAN-PRICKING INSTRUMENT. Sir—Amongst other duties, I am engaged in making a mostextensive and minute survey of a large city, showing every houseand all the drainage throughout, the scale being very large—1 inch to 100 feet; and I am preparing duplicate fair copies ofeach sheet, which is being done by pricking through all the sheetsat once, the original working drawing being placed doing this with the common prickei, I fouud that the draughts-man d
The Civil engineer and architect's journal, scientific and railway gazette . 0 3 800 t?! 3 030 37,000 2,400 21,245 560 24,000 500 PLAN-PRICKING INSTRUMENT. Sir—Amongst other duties, I am engaged in making a mostextensive and minute survey of a large city, showing every houseand all the drainage throughout, the scale being very large—1 inch to 100 feet; and I am preparing duplicate fair copies ofeach sheet, which is being done by pricking through all the sheetsat once, the original working drawing being placed doing this with the common prickei, I fouud that the draughts-man did not hold the pricker perpendicular; consequently, thelower sheets could not be accurate copies of the original. Toobviate this, I have contrived an instrument, by which any atten-tion on the part of the draughtsman in keeping it perpendicularis not required: all he has to do is to be careful that he pricksthrough the proper points of the plan correctly; the holes arethen sure to be vertically under one another, let the sheets ofpaper be ever so numerous.
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Keywords: ., boo, bookcentury1800, booksubjectarchitecture, booksubjectscience
