Subject ASC000013p
The Intellectual observer.
v.8 (1866), Page 197 (1866)
Harvard University, MCZ, Ernst Mayr Library
BHL Page 39469683
Keywords
Angle angle measurement quadrant protractor instrumentation optics metrology Rev. N.J.Heineken Geometry angle measurer invention Schmalcalders quadrant instrument Angle Measurer lens angle of altitude brass tube aperture Schmalcalder's quadrant angles measurement A New Angle Measurer Rev. N. J. Heineken scientific instrument Angle measure requiring tool angle measurer schmalcalder prism principle of Schmalcalder's quadrant