Signatures: A-C.
C3 mis-signed "A3".
"Touching parallax & refraction" on C8v is signed "T. S." and dated: Three- Nun Court in Threadneedle Street, Oct. 28. 1662.".
Reproduction of original in the Bodleian Library.
Shadow on Reel 2557:6, darkening title page and text.
Electronic reproduction. Ann Arbor, Mich. : UMI, 1999- (Early English books online) Digital version of: (Early English books, 1641-1700 ; 2557:6)