Client card describing work completed at the Roman Bronze Works Foundry for Mr. Bailey Balken, including a job number, brief description, monetary amount, and dates associated with each entry. Piece includes: "Child's Head".

From Introduction and Summary: "The first of these was Bulletin 353, dealing with the tests of rock-dust barriers; the second is the present paper, which reports tests made to determine the effect on the explosibility of Pittsburgh coal dust of altering conditions under which the tests were made; the third, dealing with tests of dust prepared from approximately 20 coals taken from beds in mines in different parts of the United States, will follow after the completion of testing in progress at the time of writing."