B chapter.indd - Charles Babbage Institute - University of Minnesota

192
Erwin Tomash Library
Bramer, Benjamin Bramer, Benjamin
usual form of the instrument). The sector was equipped
with scales for arithmetic (usually termed a line of
lines), a line of circles, a geometric line (for working
with triangles), a line of planes (for manipulating areas)
and a line of solids (for volumes) as well as others for
gnomic calculations. This instrument is notable for the
early date, just eleven years after Galileo published his
Le operazioni del compasso geometrico in 1606.
The second device was simply a parallel frame with
pointers, of use in drawing figures or etching lines. The
third instrument, a combination of plumb bob and angle
measuring device, was of use in architectural situations.
Illustrations available:
Title page
Portrait of Bramer
Bramer sector
Triangulation instrument
B 228
Bramer, Benjamin (ca.1588–1650)
B 227
Beschreibunge und Underricht Eines Neuwen leicht
und sehr bequemen Instruments zum Grundtlegen und
Theylung der Circkel Linien.
Year: 1616
Place: Marburg
Publisher: Paul Egenolff
Edition: 1st
Language: German
Figures: Figures of protractor and sighting instruments in text
Binding: later vellum
Pagination: pp. 32
Collation: A–D 4
Size: 190x150 mm
Reference: Pogg Vol. I, p. 274
This small volume is a description of a simple sighting
instrument and a protractor-like device, both for use by
surveyors.
Illustrations available:
Title page
Protractor
Sighting instrument
Benjamin Bramer, B 227
Sighting instrument, B 228