Cassegrainian telescope
Newtonian telescope
OAO
OSO
astronomical observatory
astronomical telescope
chromatoscope
coelostat
coronagraph
coronograph
heliostat
kaleidoscope
observatory
orrery
oscilloscope
periscope
planetarium
radar telescope
radio observatory
radio telescope
reflector
refractor
spectrograph
spectroheliograph
spectrohelioscope
stereoscope
telescope
optical instrument
mass spectrometer
spectrometer
air pump
benchtop
biotite
burning glass
canzonet
chronograph
depository
field-glass
fossiliferous
housewares
industrial-grade
interferometers
laryngoscope
microtome
monarque
re-placed
responder
revivification
sewing machine
spinning jenny
steam engine
stereopticon
tabasheer