PRESENTED is a fine late 19th
C. mariner’s double frame quintant with graduated arc and vernier, and bronze fittings. Engraved at mid-center of
the arc at the bottom is “Spencer Browning & Co. London”, one of England’s foremost instrument makers. Over
this is the serial number 2767. This instrument has been in a private collection for the last 35 years.
HISTORY OF THE DOUBLE FRAME PILLAR SEXTANT: The double or pillar
frame sextant was invented by Edward Thoughton, one of England’s premier instrument makers, in 1788. It is comprised of two
relatively light weight sheets of brass making up the frame that are held together by a series of pillars, nineteen
in total. This formed a rigid frame on which mounted the mirrors, shades, a telescope, index arm, and magnifier.
The Troughton double frame sextant added to the inventors reputation, but it was a highly complex instrument to make, and
gave way to more simplified designs in the mid 19 th Century. The Spencer Browning & Co. quintant is an exact
copy of the Throughton instrument, and may in fact have been made for Spencer Browning by Throughton.
For a complete history of Edward Thoughton and his brother, John see https://landandseacollection.com/id207.html
INSTRUMENT CONDITION: The mirrors are in remarkably
good condition and show little age. The beautifully turned Rosewood handle has a minor age crack on the back.
The index arm clamp, and swing arm magnifier are complete and in good working order. The double frame has a heavy
dark green to black patina of age with some variations in color, but is in excellent condition.
The instrument is complete with:
SCROLL DOWN TO THE GALLERY PICTURES
LABELS AND WRITING: In the case is a small label which reads:
excellent solid condition, with no age cracks or shrinking. There is a lock, but no key, and two original latches.
This style case went out of use by the late 19th Century. It has a wonderful old patina from golden to brown.
All in all, a highly desirable and exceptionable
Length of frame 10 1/8″
Width of frame at arc 11 1/4″
50 x 33 mm
24 x 15 mm
OUR UNCONDITIONAL GUARANTEE: If not completely
International buyers welcome, but
Buy this very special historic navigation instrument
Copyright 2009 by Land And Sea
Collection, All Rights Reserved
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