"Spencer, Browning & Co London. Made for D.
McGregor & Co Glasgow & Greenock"
radius 9 inches
This has an ebony frame, a reinforced brass index arm, an ivory scale
that is graduated every 20' from -2o to +107o and read by
vernier with tangent screw to 30" of arc. Western Union transferred it to
the Smithsonian in 1972.
Spencer, Browning & Co.