Slide Rule Master Instrument Scale
1958
Scale for use with reflecting galvanometer
1945-1954
Master Scale For Slide Rule
1920-1925
Kew wet bulb thermograph scale
Two Dividing Master Scales
1960-1965
Medicine scale in fish skin case
1850-1920
Ink scale
1940-1960
Gunter's scale, boxwood, 2' x 2"
1876
M.O. Electrical cup anemograph scale, Ref Met 23990
Bosch meteorograph scale
1937
Scale for use with reflecting galvanometer
1900-1945
Scale for galvanometer, used by Harold Thompson
1934-1941
M.O. scale for Dines Tilting Syphon rain-gauge
Boxwood scale
1758-1769
Boxwood scale
1758-1769
Boxwood scale
1758-1769