The Practical Astronomer Comprising illustrations of light and colours--practical descriptions of all kinds of telescopes--the use of the equatorial-transit--circular, and other astronomical instruments, a particular account of the Earl of Rosse's large telescopes, and other topics connected with astronomy

CHAPTER I.

Chapter 1429 wordsPublic domain

ON MICROMETERS.

Various descriptions of micrometers--_Cavallo’s_ micrometer described--To ascertain the value of its divisions--Practical uses of this micrometer--Problems which may be solved by it--Tables for facilitating its use

_page_ 443-452.