A 6 single arm protractor by Heath
A 6 diameter single arm protractor signed,'Heath, Plymouth' in copper plate script.
stick
mahogany
telescope
early
london
machine
pocket
compass
watson
century
thermometer
wooden
vintage
scientific
19th
instruments
case
cased
brass
aneroid
antique
instrument
model
rare
victorian
large
leitz
original
circa
sons
monocular
barometer
drawing
microscope
working
Antique Scientific Instruments
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