Analytical Assays Balances

BALANCES, Assay, Keller Type 38—A high grade parts gold plated.

SPECIFICATIONS:

Capacity: 2 grams.
Knife edges and bearings: Agate.
Sensitiveness: 1/200 mg. Indicator deviates 2 in dex divisions, each 1/20 inch wide, with 1/10 mg. change of load.
Releasing mechanism: Fall-away type. Smooth and gradual in operation.
Period of oscillation: 11 seconds.
Pans: Nickel silver, black interior.
Beam: The design of the beam gives great strength and rigidity. It is graduated into eleven tenths. The first tenth is marked 0 and the eleventh 10. Between 0 and 10 are 50 divisions. Length, 5 inches.
Case: Lacquered crackle enamel finished hard wood and glass with counterpoised front sliding door.

BALANCE, Assay, Keller Type 28—Similar to No. 12115. Capacity, 2 grams. Sensitiveness, 1/300
mg. Indicator deviates 3 index divisions, each 1/20 inch wide, with 1/10 mg. change of load.
Period of oscillation. 15 seconds
BALANCES, Portable Assay Set—For field assays. Comprises a pulp balance, assay balance, and
weights, in a sturdy carrying case. Dimensions: 12%xll%x6 inches.

SPECIFICATIONS:

Assay Balance

Sensitiveness: 1/100 mg.
Stirrups: Nickel silver. JeAvelled and of lightest possible construction.
Beam: Of hard-rolled aluminum alloy. Length, 5 inches. Each side graduated in 50 divisions. Provided with star wheel adjusters fitted in the center.
Hangers: Nickel silver.
Knife edges and bearings: Agate.
Pointer: At the right end of beam in a direct line with the knife edges.
Releasing Mechanism: Eccentric movement, which may be locked in connection with the beam by simply throwing a clutch provided
Case: Mahogany, with drawer large enough to receive hangers, weights, etc.
Weights: 1 gram to 1/10 mg.

Pulp Balance

Capacity: 150 grams.
Pans: Diameter,2 1/2 inches.
Sensitiveness: 1 mg.
Case: Mahogany, with drawer in which all parts of balance mechanism can be placed.
Beam: Brass. Length, 5 inches.
Weights: 1 A. T. to 1/20 A. T.
Bearings: Agate.
Net weight including balances and weights, 9 1/2 pounds