General Information

Serial #

7914-L

Part Number

1

Total Parts

3

AKA

N/A

Patents

N/A

General Description

.1 HEMOCYTOMETER, GLASS/.2-.3 PIPETS, GLASS, SYNTHETIC BEAD, TUBING RUBBER, & PLASTIC MOUTH PIECE/ CASE, IMITATION LEATHER, VELVET MATERIAL LINING, METAL CLASP/ CONTAINER FOR CASE, CARDBOARD BOX

Dimensions

Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.

Length

19.0 cm

Width

12.0 cm

Height

3.2 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Medical Technology

Category

Medical equipment

Sub-Category

N/A

Manufacturer

AKA

THOMAS

Country

United States of America

State/Province

Pennsylvania

City

Philadelphia

Context

Country

Unknown

State/Province

Unknown

Period

C.1925-1960. HEMACYTOMETERS WEREREPLACED BY AUTOMATION C.1960'S. BUT MAY BE USED FOR SOME BODY FLUIDS TODAY

Canada

HEMACYTOMETERS WITH NEUBAUER MARKINGS DECREASED THE ERROR RATE IN MANUAL CELL COUNTS BY MAKING THE BOUNDARIES MORE DISTINCT. REPLACED IN MOST LABS BY THE 1960'S BY AUTOMATED SYSTEMS, THEY REMAINED IN USE FOR CELL COUNTS OF OTHER BODY FLUIDS SUCH AS SPINAL FLUID.

Function

USED TO COUNTING RED & WHITE BLOOD CELLS IN BLOOD & FLUIDS SUCH AS CEREBRAL SPINAL FLUID. (REF.1) RED CELL COUNTS DONE BY DRAWING BLOOD TO 0.5 OR 1 MARK & DILUTING FLUID TO 101 MARK GIVING DILUTION OF 1:200 OR 1:100. BEAD IN BULB MIXES SOLUTION EVENLY. DILUTION FACTOR FOR WBC PIPET IS 1:20 & 1:10 (REF.2)

Technical

THE IMPROVED NEUBAUER RULING CONSISTS OF A DOUBLE (INSTEAD OF TRIPLE AS IN ORIGINAL COUNTING CHAMBER) LINE SURROUNDING EACH OF 16 SMALLER SQUARES WHICH GIVES THE OPTICAL EFFECT OF A SINGLE BOUNDARY LINE. THIS THEN AVOIDS CONFUSION (REF.1 & 2) WHILE COUNTING CELLS.

Area Notes

Unknown

Details

Markings

.1 HEMACYTOMETER, MARKED IN WHITE ON TOP 'IMPROVED/ NEUBAUER/ 1/400 SQ.MM./1/10 MM. deep/ NO. [ETCHED BY HAND] 7914-L/ LEVY/ULTRA/ PLANE/ C.A. HAUSSER/ & SON/ PHILA., U.S.A.'/.2 PIPET, MARKED ON WHITE BACK '6990 A.H.T. CO. PHILADA. U.S.A.' MARKED IN BLACK ON CLEAR GLASS EQUALLY SPACED LINES, 5TH & 10TH MARKED '0.5' & '1.0'. MARKED ABOVE BULB '101'/.3 PIPET, MARKED ON WHITE BACK '9116 A.H.T. CO. PHILADA. U.S.A.' MARKED ON CLEAR GLASS EQUALLY SPACED LINES, 5TH & 10TH MARKED '0.5' & '1.0'. MARKED ABOVE BULB '111'/ PT. CASE, EMBOSSED ON LID FADED GOLD LETTERING 'HEMACYTOMETER/ ARTHUR H. THOMAS COMPANY/ PHILADELPHIA/ U.S.A.'/ Pt. case, paper label on inside of lid, handwritten: ‘P.A./ 291'/ on inner edge of lid, handwritten in white paint: ‘78.1.224'./ Box container, label on top of lid: ‘Mike Boyer [handwritten in ink]/ 19-470 [stamped]/ CANLAB [Co. logo] CANADIAN LABORATORY/ SUPPLIES LIMITED/ MONTREAL - TORONTO - WINNIPEG - EDMONTON'/ Labels on both ends of lid read: ‘LABORATORY APPARATUS AND REAGENTS/ ONE No. 3369-F/ HEMACYTOMETER/ Levy Counting Chamber - Improved Neubauer Double Ruling/ ARTHUR H. THOMAS COMPANY/ PHILADELPHIA, PA., U.S.A.'/ Handwritten in pencil on one label: ‘19-470'.

Missing

COVER GLASS

Finish

.2 PIPET-CLEAR GLASS, WHITEBACKED, SYNTHETIC MIXING BEAD RED, TUBING GOLD COLOURED, MOUTHPIECE WHITE PLASTIC/.3 PIPET-CLEAR GLASS, WHITEBACKED, SYNTHETIC MIXING BEAD WHITE, TUBING GOLD COLOURED, MOUTHPIECE WHITE/ PT. CASE-IMITATION LEATHER, PEBBLED SURFACE COLOURED DARK GREEN, LINED IN DARK GREEN VELVET, METAL CLASP, CHROME-LIKE FINISH/ CARDBOARD BOX CONTAINER IS DARK GREEN

Decoration

N/A