18 A A N A L Y T I C A L C H E M I S T R Y

AINSWORTH M I C R O C H E M I C A L B A L A N C E S

IN OUR STOCK FOR IMMEDIATE SHIPMENT

BALANCE, S E M I M I C R O , Ainsworth Type TX. I d e n ­t ical in general cons t ruc t ion a n d design w i th t h e excel lent T y p e Τ Ainswor th Analy t ica l B a l a n c e b u t of smal le r ca­p a c i t y a n d a d j u s t e d for e s t ima t ions t o 0.005 m g .

Capacity—100 grams in each pan. Sensitivity—0.01 mg; weighings can be reproduced to 0.005 mg. Beam—6 inches long, of hard rolled aluminum alloy, machined

from a solid slab and finished in black with white graduations, with edges of triangular-shaped agate driven solidly into fdace, insuring permanent accuracy. Graduated into 100 notched divisions on each side of central zero, range 0 to 1 mg on each side when using a 1 mg rider so that each notch represents 1/100 mg.

Release and Arrest—Drop lever type. Knife Edges and Planes—Of agate throughout.

1887-U. Balance, Semimicro, Ainsworth Type TX, as above described, without weights but with two each 10 mg and 1 mg riders and four cushioned balance rests 437.00

BALANCE, MICRO, Ainsworth Type FDI. A rugged and robust precision balance with optical lever reading device which provides great magnification of beam de­flection without the use of a reading lens and without danger of errors due to paral­lax. Readings are made directly to 0.001 mg on the optical lever scale without inter­polation or estimation. Capacity—20 grams in each pan. Sensitivity—0.001 mg with a load of 15 grams in each pan.

Beam—5 inches long; of hard-rolled aluminum alloy, machined from a solid slab, with knife edges swaged in place. Graduated from left to right into 100 divisions, range 0 to 10 mg. when using a 5 mg rider. The beam is in equilibrium with the 5 mg rider in the zero notch. For rapid final adjustment or for readjustment of zero point, there is a small extension with 10 divisions, on the left of the beam, to take an auxiliary 0.5 mg. rider.

Optical Lever Reading Device—Consisting of a system of mirrors, low volt­age light source with special horizontal straight line filament 0.5 ampere bulb, transformer, rheostat and voltmeter for filament control, mounted in a hood on top of the Balance, and optical lever scale 100 mm long, graduated from 0 to 100 on both sides of a central zero, mounted on the base of the Balance in front of the column. In use, a narrow intense line of light is projected on the scale, each division of which is 0.5 mm wide and equivalent to View mg with a 5 mg rider on beam; but, to facilitate easy reading, the optical lever scale should be shielded from direct illumination.

Release and Arrest—Drop lever type. Knife Edges and Planes—Of agate throughout.

1889-C. Balance, Micro, Ainsworth Type FDI, with optical lever reading device, as above described, without weights but with two each 5 mg and 0.5 mg riders, replacement bulb, four cushioned balance rests and cord and plug with snap switch. For 115 volts, a.c. only 718.00

A dependable Balance is the fundamental

instrument for use in Microchemistry.

ARTHUR H. THOMAS COMPANY LABORATORY APPARATUS AND REAGENTS

WEST WASHINGTON SQUARE PHILADELPHIA 5, PA.

Teletype Services: Western Union WUX and Bell System PH-72