A brass-bound birch folding 12-inch clinometer rule
TROUGHTON & SIMMS, LONDON ; MID 19TH CENTURY
A brass-bound birch folding 12-inch clinometer rule, TROUGHTON & SIMMS, LONDON ; mid 19th Century the hinged exterior with conversion scale for CENTRIGRADE, FAHRENHEIT & REAUMER and another for ANGLE and ONE IN , the interior with brass semi-protractor graduated 90-0-90° with index arm pointer and with graduated edge in inches
A brass-bound birch folding 12-inch clinometer rule
TROUGHTON & SIMMS, LONDON ; MID 19TH CENTURY
A brass-bound birch folding 12-inch clinometer rule, TROUGHTON & SIMMS, LONDON ; mid 19th Century the hinged exterior with conversion scale for CENTRIGRADE, FAHRENHEIT & REAUMER and another for ANGLE and ONE IN , the interior with brass semi-protractor graduated 90-0-90° with index arm pointer and with graduated edge in inches
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
