with scale reading 0 - science*inclined observation telescope permits readings from sitting...
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Assures ease in manipulation and higher accuracy in making measurements because:
* Inclined observation telescope permits readings from sitting position.* Through observation telescope. the scales as well as the half-shade field
of view can be observed.* Direct vernier readings can be made to 0.01° and estimated to 0.0050.* Moveable carrier, holding two polarimeter tubes, facilitates procedure
of examinations.* Coaxially-mounted coarse and fine adjustment knobs and switch con-
trolled by right hand resting on table-top.* Interchangeable built-in sodium or mercury spectral bulbs furnish
strictly monochromatic light controlled by precision interference filters.* Newly-designed, precision polarimeter tubes ensure the absence of
strain, further assurance of true measuring results.
with scale reading to 0.050
*Inclined observation telescope permits readings from sitting position.* Glass scale. verniers and Laurent half-shade plate (triple field of view)
are observed in the same telescope.* Illumination by either a double filament 40-watt bulb or sodium spectral
bulb.*Newly designed, precision polarimeter tubes ensure absence of strainiresulting in true measurements.
IN WEST GERMANY Direct vernier readings can be made to 0.05i and estimated to 0.025..
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~ Z~~~fSW FF Jj~ 4#~ SERVICE FACILITIE485 FIFTH AVENUE, NEW YORK 17, N. Y.
SCIENCE, VOL. i31
MADE
1638
worthl a tousand words.. jLet your shtudents see science in actionfor themselves with these laboratory-provedteducationial instruments byBausch. & Lomnb. They'll understandbetter, faster--be eager)to learn mnore.
B&L STANDARD TEACHING* MICROSCOPES. Standard size and operation; sturdy,
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r B&L MACROSCOPES* are ideal for gross studies, field trips, dissection. Easy focus, large
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of slides, opaque objects, even chemical reactions. B&OL SPECTROSCOPES. Basic chemical
analysis tools; show spectra of elements. STUDENT-PROOF construction of all instruments gives
years of service at a cost to fit any school budgot. WRITE for Catalog E-152; demonstration on
request. No obligation, of couise. Bausch & Lomb,
64206 Bausch Street, Rochester 2, New York._
*.Tradem(trk, Baiusch & Lomb1640 SCIENCE, V(OL 131