Microchemical Balance

One of the leading micro chemists in the U.S.A. is responsible for the development of this new balance.  Based on ideas and suggestions by him, Christian Becker built the original model for his exclusive use.  Results were so satisfactory, however, that it was decided to make the balance available to all chemists.

Model EM-1 is an equal arm micro balance that offers the highest possible accuracy and precision. The  optical reticle on the pointer has 12 lines each side of zero. You can either read the magnified image  of the reticle directly on a matte reading screen or from an adjustable mirror. As each graduation represents 0.01 mg., determinations to 1 gamma (0.001 mg.) are possible.

A timed-sequence arrestment not only prevents undue attrition of knife edges but assures a smooth release.  Two pairs of arrest arms, turning on a common axis with the beam, place the stirrups on the terminal knife edges, then the center knife edge on its bearing. The reverse sequence applies when the balance is arrested.  The same mechanism that operates the beam arrest also operates the pan arrest. (If desired, the pan arrestment may be operated independently).

To prevent lateral tilting while loading and unloading pans, the stirrups are provided with a stabilizing  device. Stirrup guards prevent damage to stirrup planes and terminal knives through accidental displacement  of stirrups from points of support.

Each pan on the EM-1 has a capacity of 20 grams. Sensitivity is such that 0.1 mg. gives a 10 index division deflection. The beam, made of engraver’s metal, is 4″ long—notched 0-10 mg. (Each of the 101 notches  represents 0.1 mg.). Pans, made of stainless steel, are 1 1/2 in diameter. Zero adjustment is externally  controlled by means of the star wheel at the left end of the beam. The mahogany case has front and side doors,  plus a removable top.

No. B-1360X Microchemical Balance, as described, complete with 6V transformer for 110 Volt A.C. current, each $875.00