All pencils are made with California cedar sustained yield wood casings. Kit includes: White charcoal pencil, 2 flat sketching pencils, 4B graphite pencil, 2 extra soft layout/drafting pencils, and Graphite sticks (2B, 4B, 6B).
The transits main scope is 9" long which would make this a light mountain size transit.
It has an image erect and the optics are crisp and clear. The silvered vertical circle is 4" and has an aux Stadia scale as shown. Even the leather strap is original and stamped with the serial # 28294.
The first edition of this historic book was published in 1688.
This is a Twelfth edition published in 1793 and is in good condition considering it age.
Magnetic deviations would adversely affect a magnetic compass and so they were not an accurate means to determine ones location in many areas.