Hourglass, Glass and Brass, used as Log-glass with 14 sec duration. In the lid we find the inscriptions 1827 and 14. Can be closed by rotation of the inner cylinder. Orange collared Silicate.
One of the first mechanical ‘Perpetual logs’. V-shaped brass plate incorporating register dials and engraved above the rotator Edw. Massey / LLL Patentee / London / 6082 -- 13in. (33cm.) long
Book by David Thomas to explane his Lunar corrector ruler. 'For new and concise methods of performing the calculations necessary for ascertaining the Longitude by Lunar Observations'
Two Blueback Charts PUBLISHED BY RICHARD H. LAURIE. LONDON
1) "The Southern Part of the North Sea". Circa 1869 2) "A General Chart of the Coasts of Brasil. &c. From the River Para to Buenos Ayres ...". Circa 1842