U. S. Bureau of Mines Collection - C-828-BC Measuring the Hardness of a Specimen of Titanium

Photograph

-

Boulder City/Hoover Dam Museum

0022:0151: U. S. Bureau of Mines Collection - C-828-BC Measuring the Hardness of a Specimen of Titanium ["the hardness of the small ingot made by melting the compacted sample of sponge in the arc furnace is measured by the Brinell test. To do this, a flat surface is formed on the ingot by turning it in a lathe and then a hardened steel ball one centimeter in diameter is pushed against the flat surface by a hydraulic ram which exerts a force of 3,000 kilograms. The hardened ball makes a circular depression in the surface of the ingot, and the softer the metal, the deeper and larger the depression. The Brinell machine for making the impression is shown in the upper left and the operator is using a microscope to measure the diameter of the impression he has made in a specimen."]
0022:0151

U. S. Bureau of Mines Collection - C-828-BC Measuring the Hardness of a Specimen of Titanium ["the hardness of the small ingot made by melting the compacted sample of sponge in the arc furnace is measured by the Brinell test. To do this, a flat surface is formed on the ingot by turning it in a lathe and then a hardened steel ball one centimeter in diameter is pushed against the flat surface by a hydraulic ram which exerts a force of 3,000 kilograms. The hardened ball makes a circular depression in the surface of the ingot, and the softer the metal, the deeper and larger the depression. The Brinell machine for making the impression is shown in the upper left and the operator is using a microscope to measure the diameter of the impression he has made in a specimen."]

Name/Title

U. S. Bureau of Mines Collection - C-828-BC Measuring the Hardness of a Specimen of Titanium

Entry/Object ID

0022:0151

Description

U. S. Bureau of Mines Collection - C-828-BC Measuring the Hardness of a Specimen of Titanium ["the hardness of the small ingot made by melting the compacted sample of sponge in the arc furnace is measured by the Brinell test. To do this, a flat surface is formed on the ingot by turning it in a lathe and then a hardened steel ball one centimeter in diameter is pushed against the flat surface by a hydraulic ram which exerts a force of 3,000 kilograms. The hardened ball makes a circular depression in the surface of the ingot, and the softer the metal, the deeper and larger the depression. The Brinell machine for making the impression is shown in the upper left and the operator is using a microscope to measure the diameter of the impression he has made in a specimen."]

Collection

US Bureau of Mines, Boulder City Businesses

Made/Created

Artist Information

Artist

U. S. Dept. of the Interior - Bureau of Mines

Role

Photographer

Time Period

not provided

Notes

Original or Negative: Original

Location

Location

* Untyped Location

Research Room, Photo Drawer 11

Date

June 22, 2026

Created By

[email protected]

Create Date

February 2, 2024

Updated By

[email protected]

Update Date

June 22, 2026