Catalogue. A.H. Abbott & co., manufacturers and importers of mathematical and surveying instruments and drawing materials of every description .. (1896)
Abbott, A. H., & co., Chicago. [from old catalog] · [Chicago] · leaf 133
No. Each. 975. American Dumpy Level, for work not requiring greatestaccuracy, such as ditching, draining, road leveling, etc.Achromatic telescope 11 inches long, object glass X%inch, with rack movement, graduated bubble. Adjustableeye piece to focus cross hairs. Level complete withmetal trivet,… … 976. Architects or Builders Y Level, telescope is 11 incheslong, has cross hairs and a divided bubble. The hori-zontal circle is three inches in diameter, and divided todegrees. Has a vernier reading to 5 minutes. Price ofinstrument in polished box and including plumb bob,adjusting pins and tripod…
Drawing instruments
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