#Slide ruler manual#
Since the Computer Manufacturing Company of San Francisco did not move to this location until 1921, the instrument and manual were probably sent out in 1921 or later. It was copyrighted in 1919, but the address "340 Sansome St." is handwritten on page 3. Ross Precision Computer Instruction Manual Description This deteriorating 16-page booklet was received with 1996.3077.01. Location Currently not on view date made maker Computer Manufacturing Company ID Number 1996.3077.03 nonaccession number 1996.3077 catalog number 1996.3077.03 Data Source National Museum of American History A second printed note, of the same size, announced the addition of trigonometric scales to the Precision Computer even though the price remained at $20.00. Enclosed were a 3-1/4" by 6-1/2" printed note addressed "To Men in the Army and Navy," describing the suitability of the instruments for military purposes.
#Slide ruler trial#
The letter, dated July 31, 1918, notes the availability of the instruments and offers them on a trial basis. Also received was a short letter initialed by the inventor of these devices, Louis Ross, and addressed to Roy Kegerreis of New York City. 3, January 15, 1916, and Engineering News 75, no. It also cites press releases published in Scientific American 114, no. The flyer provides photographs and descriptions of the three instruments. Ross Precision Computer Related Documentation Description Two copies of an advertising flyer for the Ross Precision Computer, the Ross Meridi-o-graph, and the Ross Rapid Computer were received with 1996.3077.01. ID Number MA.271855.01.03 accession number 271855 catalog number 271855.01.03 Data Source National Museum of American History Location Currently not on view date made 1907 maker Keuffel & Esser Co. K&E's Improved Reckoning Machine is advertised at the back of the booklet. He suggested "special applications" for his instrument, including conversion of weights and measures currency exchange pro-rating among accounts calculating taxes, investment returns, and payrolls and physical computations such as mechanical power, centrifugal force, and mensuration. Thacher also provided solved examples for practice.
![slide ruler slide ruler](https://sermonary.s3.amazonaws.com/uploads/2020/12/Refuge-Psalm-91-Sermon-Series.jpg)
The booklet explained the processes for calculations involving multiplication, division, proportion, powers, and square and cube roots. This copy was printed in 1907 and sold for one dollar. Keuffel & Esser of New York, which distributed and, later, manufactured Thacher slide rules, reprinted the booklet in 19 as Directions for Using Thacher's Calculating Instrument. Instructions for Keuffel & Esser 4013 Thacher Cylindrical Slide Rule Description Edwin Thacher, the inventor of the cylindrical slide rule bearing his name, published instructions for using the instrument as Thacher's Calculating Instrument or Cylindrical Slide-Rule (New York: Van Nostrand, 1884).