Collection:
Juneau—Douglas City Museum
Object ID:
2003.58.023 A—P
Accession#:
2003.58
Credit Line:
Donated by the U.S. Bureau of Land Management.
Object Name:
Balance, Assay
Title:
Ainsworth Long—Beam Button Assay Balance
Date:
1940
Description:
A — Ainsworth long—beam button assay balance. Black glass and painted aluminum case. Glass top and four sides, including glass sliding door. 20 centimeter beam.
B—C — Two equipment drawers in case.
D — .5 inch by .625 inch by 4 inches tweezers. Stainless steel with white plastic tips.
E — .5 inch by 1 inch by 5l.5 inches brush. Dark bristles. Wood handle. "1/2" / M. GRUMBACHER N.Y. 3651 U.S.A."
F — .625 inch by 2.5 inches diameter set of scale weights. Black Bakelite round case. "Wm. AINSWORTH & SONS / NO. 100 / DENVER, COLO, U.S.A." embossed on front of case. Brass screw separates case to open. Contains 12 tiny silver weights of 1 gram and two pieces fine wire (riders). Green felt case lining.
G — 1.5 inches by 1.625 inches by 1.75 inches small round poly snap—lid case marked "Pans" containing:
H—I — two .125 inch by .875 inch diameter tiny black pans.
J—K — Two .125 inch by .875 inch diameter tiny silver—colored metal pans.
L—M — .5 inch by 1.75 inches by 3 inches assay balance stirrups and hangers. Silver wire with stirrup hangers to set on balance beam. Red agate insets at contact points.
N — 5 inches by 7 inches "Instructions for Setting Up and Cleaning / Ainsworth Assay Balance". Sheet printed on two sides.
O — 5.375 inches by 8.875 inches "Wm Ainsworth & Sons / … / Certificate of Test". Printed sheet "Set No. 100T / Serial #15998".
P — Same as "O". "Set No. 4050 / Serial No. 18633".
B—C — Two equipment drawers in case.
D — .5 inch by .625 inch by 4 inches tweezers. Stainless steel with white plastic tips.
E — .5 inch by 1 inch by 5l.5 inches brush. Dark bristles. Wood handle. "1/2" / M. GRUMBACHER N.Y. 3651 U.S.A."
F — .625 inch by 2.5 inches diameter set of scale weights. Black Bakelite round case. "Wm. AINSWORTH & SONS / NO. 100 / DENVER, COLO, U.S.A." embossed on front of case. Brass screw separates case to open. Contains 12 tiny silver weights of 1 gram and two pieces fine wire (riders). Green felt case lining.
G — 1.5 inches by 1.625 inches by 1.75 inches small round poly snap—lid case marked "Pans" containing:
H—I — two .125 inch by .875 inch diameter tiny black pans.
J—K — Two .125 inch by .875 inch diameter tiny silver—colored metal pans.
L—M — .5 inch by 1.75 inches by 3 inches assay balance stirrups and hangers. Silver wire with stirrup hangers to set on balance beam. Red agate insets at contact points.
N — 5 inches by 7 inches "Instructions for Setting Up and Cleaning / Ainsworth Assay Balance". Sheet printed on two sides.
O — 5.375 inches by 8.875 inches "Wm Ainsworth & Sons / … / Certificate of Test". Printed sheet "Set No. 100T / Serial #15998".
P — Same as "O". "Set No. 4050 / Serial No. 18633".
Notes:
Used by U.S. Bureau of Mines for mineral resource evaluation and analysis. Used in petrographic and live assay laboratories. "8057" is USBM identification number.
Tiny gold assay bead found in drawer "C", about .03125 inches diameter.
D—M — All accessories stored in drawers.
N—P Papers separate.
See document file for Ainsworth Assay Balance Type VM which looks like .023. Also description of difference in traditional balance (.023) and chain weight balance.
Tiny gold assay bead found in drawer "C", about .03125 inches diameter.
D—M — All accessories stored in drawers.
N—P Papers separate.
See document file for Ainsworth Assay Balance Type VM which looks like .023. Also description of difference in traditional balance (.023) and chain weight balance.
Search Terms:
Government
Federal
Geological
T&E
JMIC
Prospecting
Mining
Federal
Geological
T&E
JMIC
Prospecting
Mining
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Ainsworth Long-Beam Button Ass
Ainsworth Long-Beam Button Ass
Ainsworth Long-Beam Button Ass
Ainsworth Long-Beam Button Ass