Subject ASC0000dm7
The Intellectual observer.
v.8 (1866), Page 448 (1866)
Harvard University, MCZ, Ernst Mayr Library
BHL Page 39469948
Keywords
machinary telescope equipment Drawings Position Micrometer substitute by ChRles Grover Perforated cardboard disk with conspicuous wire Pair of stars in the field. Illuminating apparatus for substitute Position Micrometer. Small paraffin lamp Position of screw and hole for admitting light. micrometer keyhole lock Parts: Mechanical Engineering drawing tools illustration substitute for position micrometer astronomy position micrometer diagram handle heater target. scope apparatus design