micromprojectionl - science...with leitz phase contrast equip-ment, you make a continuous transition...
TRANSCRIPT
SMALL-GROUP STUDYIN A NORMALLY LIT ROOM
The image is cast upon a screen in thedark-chamber turret at table height. Eachobserver (up to 10) has a separate light-excluding viewing hood. The pathologisthere is discussing a slide with the surgeon;the unused hoods are easily shuttered off.
LARGE-GROUP EXHIBITIONIN THE DARKENED AUDITORIUM
So intense is the Scopicon light source thatImages up to ten feet across can be pro-jected. Through a system of auxiliary lensesthe operator can follow a biological speci-men through a progressive series of ever-closer localizations, up to ultimate demon-stration under oil-immersed objectives.
a or10orlOOoQuickly adaptable to viewing on any scale, the mobileScopicon couples convenience with efficiency. Its high-pressure mercury arc is the brightest light source everemployed for microprojection. The focal spot is only1 mm square (approx.). Its pinpoint character permitsflickerless projection of sharply detailed images up toten feet across even under oil-immersed microscopeobjectives. Let us send you the brochure describing thisremarkable instrument.
micromprojectionl equipmentSCOPICON, Inc. 215 E. 149 ST. NEW YORK 51 I
"Detailed reading and use have served to strengthen my beliefthat it is the best teaching text in the field of Comparative Anat-omy that I have encountered in twenty years of experience."Professor lWillianm A. Campbell, College of the Holy Cross
Have you looked at a copy lately?
THE VERTEBRATE BODY. By ALFRED S. RONIER, Alexander Agassiz Professorof Zoology and Director, Museum of Comparative Zoology, Harvard University.643 pages, 6" x 9", with 987 illustrations on 363 figures. $6.00.
W. B. SAUNDERS COMPANYWest Washington Square Philadelphia 5
February 8, 1952 1
..,Vx,
n j
UNSURPASSED STABILITY
EXCEPTIONAL LIGHT SENSITIVITY
PATENTED MAGNETIC MODULATION
NO ZERO ADJUSTMENTCONVENIENT SMALL SIZE 5x71A4x13 IN.LIGHT IN WEIGHT-ONLY 111/2 POUNDS~~~~~~~~~~~~~~~~~A__The SPECIAL FEATURES OF THE DENSICHRON qualify it for use in many light-measuring operations in scientific research and industrial process control. Some of the labora-tory applications for which the DENSICHRON is particularly well adapted are-
PHOTOMICROGRAPHYCHROMATOGRAPHY*
REFLECTOMETRY
MICRODENSITOMETRY
COLORIMETRY* See "Quantitative Paper Chromatography for Students" by Patton, A. R., Jr. Chem. Educ., 28, 629 (1951)
The DENSICHRON is supplied complete with a blue-sensitive light probe (or red if specified),five measuring apertures, a cone with I/8 inch aperature, and metal support for the probe unit.The current consumption is 30 watts. For operation on 115 volts-60 cycle AC only-
WRITE FOR 12-PAGE BOOKLET GIVING OPERATION CURVES, RESULTS EACHOF LABORATORY TESTS AND OTHER VALUABLE INFORMATION. $225.000
Reflection Unit Accessory with Voltage Regulated Transformer-$75.00
SCIENCE, Vo1. 115
I
2
h.ase contrastequipment
...gives you finger-tip control-at lower cost
With Leitz Phase Contrast Equip-ment, you make a continuoustransition from "brightfield" to"phase contrast" to "darkfield"simply by adjusting the height ofthe mirror body in the condenser.There is no cumbersome substageapparatus, no interruption of ob-servation to unscrew and replaceobjectives. The construction of thespecial condenser, after Heine,allows maximum resolution withboth achromatic and newlydesigned apochromatic objectives.This sweeping versatility eliminatesthe need for numerous specialobjectives. Consequently, yourLeitz equipment, which covers thecomplete range of contrast, willcost you under $900. Compare,and seethe difference,in economy,versatility and ease of operation.
(1) Special Condenser after Heine with rack andpinion (Tr) for adjustment in height ofmirror body (Sk); supplied with Screw-OnImmersion Cap (la); centering screws (S)
(2) Achromatic Dry Objective Pv 10/0.25(2a) Slip-on Immersion Attachment for Objective
Pv 10/0.25(3) Achromatic Dry Objective Pv 20/0.45(4) Apochromatic Dry Objective Pv Apo 40/0.70
with cover glass correction mount andautomatic sharpness compensation
(5) Apochromatic Oil Immersion ObjectivePv Apo Oil 90/1.10
(6) Filter Holder(6a) Daylight Filter and photographic green filter(7) Focusing Magnifier
For details, Write Dept. SC
E. LEITZ, Inc., 304 Hudson St., New York 13, N. Y.
L E I T Z M C R O S C O P E S S C I E N T F C I N S T R U M E N T S * B I N O C U L A R S
LEICA CAMERAS AND ACCESSORIES
SCIENCE, Vol. 1154
c"This is a remarkable book,
written by a remarkable man."1 "Foranyone who likes a challenge to exert hismind, the rewards offered in these pages
are abundant beyond description.
MAN ON HIS NATURE is a famous biologist'sfearless and invigorating philosophy con-
cerning the origins of life, and a tale of theknowledge and wonder upon which he founds it."Sir Charles Sherrington ranges the entire fieldof man's reflection on his nature-embryology,anatomy, brain and nerve physiology, psychol-ogy, contacts with the outside world-and makesa masterly synthesis of the best of recordedthoughts and opinions."3Beyond that "it is a magnificent artistic
achievement, like a great fresco, a grand sym-phony, or an heroic poem or drama.'"4 SirCharles's astonishing accounts of some of theprocesses of nature in living organisms are lyri-cal testimony to a man's continual wonder andquestion before the processes he is investigating.Here is a small excerpt:
The child's eye is not only an eye true to thehuman type, but an eye with personal likenessto its individual parent's. The many cells whichmade it have executed correctly a multitudinousdance engaging millions of performers in hun-dreds of sequences of particular different steps,differing for each performer according to hispart. To picture the complexity and precisionbeggars any imagery I have. But it may help usto think further."MAN ON His NATURE was selected as one of
the 100 great books of our time at the Festivalof Britain. For it is "the one indispensable bookwhich every educated person of our time should
make it his business to read. Few books havebeen published in our time as important as this.It is destined to have a profound effect upon thephilosophy of the present and the future." 5
This second edition has been entirely revisedby the author, and completely reset.1. The Thoinist 2. Boston Globe 3. Science News Letter
4. Science 5. Isis
FMAN ON
HIS NATURE
By Sir CharlesSherrington
Second Edition$6.00 at all bookstores
CAMBRIDGE UNIVERSITY PRESS2February 8, 1952 5
FOR ROUTINE HIGH-CEAn ultracentrifuge to concentrate, purify,and classify macromolecules and colloidalmaterials-proteins, viruses, enzymes, 144,000
chemical precipitates, etc.
Interchangeable angle-type rotors run in
vacuum chamber equipped with refrigera-tion for controlled rotor temperatures.
Automatic electronic controls govern theentire fast cycle of operation, monitor theself-balancing quiet 40,000-rpm electricdrive. Double armor-steel guard and inter-
locks combine safety with dependability.
Sendfor comptete information on
Model L Preparative UltracentrifigeSPECIALIZED INSTRUMENTS
CORPORATION605 O'NEILL AVE., BELMONT, CALIF.
First Time Offered!PORTABLE
| ~~~RESPIRATORYFOR respiratory tests, and evaluation of pa-tients who face operations within the chest..
The force required to operate this meter, either
pressure or vacuum, is onily a fraction of an
ounce per square inch. Consequently it is ideally
suited for the determination of lung capacity..Index reads from .01 to 1,000 liters. Large dial
pointer makcs one revolution per liter.For further information write:
Catalog No. 70-851 ....... $125.00
ISCIENCE, Vol. 114
I
6
-~~~~~~~~E35 POWER ERCIGMICROSCOPE"AVIIPosition" Universal Mount DESIGNED FOR GREATER UTILITY ..*. VERSATILITYJoint Tension Fully Adjustable
I 1 fIAR TV* s vvGives you 3" of Working Space- AMAZING CLARITY from Objective to Platform.
A1 TRULY FINEOPTICAl INSTRW5T Swings To Any Position . . . Easily, Quickly!
EWorth $75.00 A remarkable Instrument! Excep- permits any work, dissection, tool-
But Our Price tional Value! Prism Erectors give ing, etc. to be carried on "underyou an erect image-exactly as your power" while looking through Micro-
ONUlflLY 4>r eye sees it, not upside-down as in scope. The Instrument is 6k" longan ordinary Microscope. Ramsden with base 7" x 9". Only because we
S$ 5o 3 i.* Eye-Piece permits fine precision were able to utilize some war surplusfocusing. 3-Element color corrected parts are we able to offer such aobjective - 1" diameter. Microscope fine Optical Instrument-easily worth
COMPLETE bo is of brass with black crackle $75.00-at this special low price.finish. Working distance from ob-jective to object is almost 3", which Stock No. 970-W %.... $29.50 Postpaid
DON'T MISS THIS BARGAIN *SATISFACTION GUARANTEED
New Product Dpatmeat I
LVVItAI 1tZtIZ^KI^lll > ! POCKE3T HEAT , n* DU DLOOK AT THESE BARGAINS!. oCl eter ANW REMOUNTED PROJECTION LENS-Speed F/1.9 . . . F.L. 15 for Cold WeafheroroutnD re Kep hdRmm. $22.00 value for $7.50. Low Reflection Coated. Used on 0" Ideal for outdoorsmen! Keeps hands8 or 16 mm. Movie Projectors . . . or to make a Desk Viewer §. .- warm in coldest weather. Works b it-or Editor for 16 mm. Micro-film Reader . . . for Con-
-
=self-no wires, no a eries. MagicStock #rojetor-. Postpaid very smallitems.'heater element reacts with fuel, stays8to-ek #4045-W ..................... $7.50 Postpaid s L;O......warm24 hrs. at a time'. AbsolutelyLENS CLEANING TISSUE-1st quality, sheet size 11" x 7%". safe. Practical, proven.Made to Gov't, spec. Free of abrasives. High wet strength. s Practicl prOn!Stock #721-W ...............500 sheets ......... $LOO0Postpaid
Stc .8W.....Ony2.49.Pstpai
SLIDE PROJECTOR SETS-Consist of all unmounted lensesyou need to make the following size projectors:Stock #4029-W--35 mm.. .$2.85 PostpaidStock #4039-W. 21x2 ...... $3.35 Postpaid RONCHI RULINGS-BLACK LINE GRATINGStock #4039-W. 2 "x24 .. . 35 Postpaid Plate glass with etched parallel black lines-space between
LOOKI LOOK! LOOK! the lines is same as thickness of the ruled line itself. Nor-
Sheet Polarizing Material- mally cost $4.00 to $5.00 per sq. inch.Stock #61-W ...... Pair of 1" dia. Circles ...... 200!Pstpd. 1 in. x 1 in. 2 In. x 2 In.Stock #692-W. Pair of 2" dia. Circles. 35¢ Pstpd. Stock Lines Stock Lines
No. Per In. Price No. Per In. Price2122W 65 $.75 2133-W 65 $1.50SO MUCH for SO LITTLE! 212-W 85 .75 2134PW Pri
SIMPLE LENS KITS!-Kits include plainly written, illustrated 2127-W 110 1.00 216W 110 2.00
booklet showing how you can build lots of optical items. 2128W 120 1.00 2137-W 120 2.00
Use these lenses in experimental optics, building TELE- 2129-W 183 1.00 2138-W 150 2.00
SCOPES, low power Microscopes, etc. 2130-W 150 1.00 2139-W 150 2.00
Stock 42-W-10 len .............1....... L00 Postpaid 2131-W 175 1.00 2140W 175 2.00
Stock #5-W-45 lense .................... $5.00 Postpaid All above sent Postpaid.Stock #10-W-80 lense .................... $10.00 PostpaidMOUN?TED ANA#TIGMAT LENS-Free booklet with your 8 P ELBOW Telescope
order: "How to Make Your Own Enlarger." u Power . _erSpeed f/7.7, focal length approx. 127 mms. Suitable for pic- i OUR PRICE $27.50tures, negatives, positives up to 3% x 4%". Big 2 diameter .bject0ve.
Stock No. S00I-W .............. $7.50 Postpaid All l ensesA chromatic.AmiciTERRIFIC BARGAIN! BUBBLE SEXTANT _rism erects the image. 4
BRAND NEW and with Automatic Electric Averaging Device nuilt-in filte Scleariamber,and Illuminated Averaging Disc for nighttime use. Govt. neutral and red. alightlycost $217. Though brandt new, we- UIbAv -ft,keced Bubble ate o efc okncost $17. Thoggh brandnceckV ^ ulused condition but all guar-and Collimation and guarantee perfect working order. o C oarer. forWeight wolbs.Pr~~~iceicuewooden carr ing dase. Full directions for °'order. Wetg 5 lbs.
use accompany each shipment. $2001 Stock t48-W $27.50 Pstpd.stock #983-W .................. ...... $22.50 PostpaidNON-ABSORBING BEAN-SPLITTING MIRROR - Latest BUBBLE SEXTANT-TYPE A-8A. Excellent condition but
development! Optically fiat to 'A wave length. Size: may be slightly used. Each has been carefully checked and
1-15/16" x 2 15/16" 31 thick. Reflects approximatelyz collimated. Averagin~g device for nighttime used. Carryln~
and transmits p roximately 50%. No.light Isabsorb. Case and instruction booklet included. Gov't cost abou
Has a three-layer film which accomplishes non-absorption. Stock #9W .$32.50 Postpaid
Stock #567-W ................. $5.00 Postpaid TELESCOPE LEYE-PIECE-Consists of 2 Achromatic lenserZ > ^ t ~~~~~~~~~~~~~~~F.L.28 mm. in a metal mount.\{9 t ~~~~~~~~~~~~~~~~~~~~~Stoclk #5140 W ..... 4.50 Postpaid
IF YrOU'RtE INTERtESTED IN OPTICAL BARIGAINS 10Send Check or MA..t~~~ ~ ~ ~~~~~~~~~W moveforel AUUMof&l|!Wur Sw
-_ 0DEI I OCST0CI Satidutie Goaratd
rAu_s_~~~~f Ffe6! Is auo7pmeflf 7RECTLGW lo ndP o a tBfu
~erur 0 i1)
0
I
t-enruary z, JLVOZ
From the moment you position yourslide . . . to your final look at the specimen
... you are enjoying a whole newexperience in microscopy. You've never felt
such smooth rolling focusing actionas Dynoptic ball bearing motion. You'venever known such comfort. Your hand is
completely at rest on the table for operationof fine adjustment, mechanical stage,
substage condenser controls, andilluminator switch . . . all withineffortless reach. You-and your
work-will benefit from these exclusivecomfort and convenience advantages of the
6422 S.aould st.Riest 2tibo,to-y microscopes.
*for ~FREE DEMONSTRATIONand LITERATURE. See for yourself how pis
_ Bausch & Lomb Dynoptic Microscopes \ELout-perform any laboratory microscope
_ever made. Bausch & Lomb Optical Co.,~~~~~~~~~~642-20 St. Paul St., Rochester 2, N. Y.
SCIENCE, Vol. 1158