The Duodecimal Bulletin

Editor: Ralph Beard

Contents:

• Revolving Duodecimals | F. Emerson Andrews (page 1_z)
• Table of Periods and Submultiples of Reciprocals of Primes | George S. Terry (page 4_z)
• Duodecimal Tools for the Machinist | M. Irving Chriswell (page 5_z)
  • The Micrometer (page 5_z)
  • Advantages of the Suggested Micrometer (page 6_z)
  • The Scale (page 8_z)
• Excerpt: Base du Systeme Metrique Decimal | Mechain and Delambre (page 9_z)
  • Reply to editorial of The Edinburgh Review, reprinted in Duodecimal Bulletin, WN 3
• Additions to Duodecimal Bibliography (page A)
• Book Review (page 10_z)
  • Units of Weights and Measures | Dr. Walter Renton Ignalls, President of American Institute of Weights and Measures
• Membership Status (page 11_z)
• Table of Duodecimal Natural Sines and Cosines (page 12_z)
• Table of Duodecimal Natural Tangents and Cotangents (page 13_z)
• Opinions and Suggestions (page 14_z)
  • Lewis Carl Seelbach (page 14_z)
  • William Shaw Crosby (page 14_z)
  • Harry C. Robert, Jr. (page 15_z)
  • Dr. R. A. Millikan (page 15_z)
  • Raymond Kassler (page 15_z)
  • Paul Van Buskirk (page 15_z)
    • Man and Measure | Edward Nicholson (page 16_z)
  • Dudley A. George (page 16_z)
• Mathematical Recreations | Mary Lloyd, editor (page 18_z)
• Problem of the Coconuts | Harry C. Robert, Jr. (page 1A_z)
• The Mail Bag (page 1B_z)
  • Mrs. F. Howard Seely & daughters Mary Seely & Dorothy D'Ooge (page 1B_z)
  • Mr. & Mrs. Jamison Handy (page 1B_z)
  • Arthur Coldewe | San Anselmo, CA (page 1B_z)
    • Civil Engineer’s Handbook | Trautwine (page 1B_z)
  • Responses to “Duodecimal Mathematics” in Office Appliances June 1161_z (1945_d) (page 1B_z)
    • Letters from Copenhagen, Sweden, Gothenburg, Norway
  • Responses to New Numbers | F. Emerson Andrews (page 20_z)
    • Mr. Gutmann | Whangarei, New Zealand
    • Professor J.C. Codrington | Habana, Cuba
  • Dr. Nathan Lazar | Teachers College, Columbia University (page 20_z)
  • “Historical Sketch of the Foundation of the Metric System” | Leon Bassot (page 20_z)
  • “Men of Mathematics” | Eric Temple Bell (page 21_z)
    • Material about Lagrange
  • On Weights and Measures | Harry C. Robert, Jr. (page 23_z)
• How to Count by Dozens (page 25_z)