ROSS PRECISION COMPUTER. CIRCA 1915. RARE SPIRAL SLIDE RULE. ONE OF A KIND.
Item History & Price
| Reference Number: Avaluer:27009556 | Model: Ross precision computer |
| Country/Region of Manufacture: United States | Modified Item: No |
PLEASE, CONFIRM WITH THE BUYER IF I CAN SHIP TO YOUR COUNTRY. MY POSTAL SERVICE ONLY SEND TO THE FOLLOWING COUNTRIES:
UNITED STATES. GERMANY. ARGENTINA. AUSTRIAN. BELGIUM. BULGARI. CHILE. CHINA. KOREA. CROATIA. DENMARK. EGYPT. ESLOVAQUIA. ESLOVENIA. SPAIN. ESTONIA. FINLAND. FRANCE. UNITED KINGDOM. HOLLAND. HONG KONG. HUNGARY. INDIA. ISRAEL. ITALY. JAPAN. LETONIA. LITUANIA. LUXEMBOURG. MEXICO. NORWAY. POLAND. PORTUGAL. CZECH REPUBLIC. RUMANIA. SENEGAL. SERBIA. SWEDEN. SW...ITZERLAND. THAILAND. VIETNAM.
NEW COUNTRIES: ANDORRA. CANADA. COSTA RICA. GREECE. IRELAND. SINGAPUR. UCRANIA.
I CAN SEND WORLDWIDE WITH FEDEX, BUT THE SHIPPING COST IS VERY EXPENSIVE FROM MY COUNTRY (USD 90 TO USD 120)
M U S E U M P I E C E
ANTIQUE ROSS PRECISION COMPUTER. CIRCA 1915. VERY RARE SPIRAL SLIDE RULE. ONE OF A KIND IN EBAY.
The Ross Precision Computer, circa 1915, is a circular slide rule. It was unique in that its scale was 120 times greater than the scale an a typical 10 inch slide rule, which allowed the Ross computer to provide results to an accuracy of five signifcant figures. This instrument consists of a disk on which is engraved a spiral logarithmic scale having 24 terms and a total length of 30 feet. Two radial celluloid arms are pivoted at its center. The graduations correspond to 0.0001 of the total length.
Keyword(s) : spiral logarithmic scale.
Scientific Discipline: mechanical engineering, mathematics.
Publications:New five - place computer. Railway age gazette, 59 (12) 529 (sept 17, 1915). New graduated spiral slide rule. Engineering news, 47 (14) 672 (sept. 30, 1915)
Object dimensions: 31 x 25 x. 2 cm.
The black plastic case/box seems to be not original.
The price of this item in 1915 was usd 28, 50 (SEE LASTS PICS) An expensive piece in 1900s. Imagine the actualized price (more than usd 600)
MANUFACTURED BY COMPUTER MFG CO., SAN FRANCISCO. COPYRIGHTED L. ROSS. SAN FRANCISCO (PATENTS PENDING)
GOOD CONDITION, CONSIDERING ITS AGE (+100 YEARS OLD)
I ONLY SEND THE ROSS PRECISION COMPUTER SLIDE RULE AND THE BLACK PLASTIC CASE/BOX. NO PAPERS.
I CONSIDER ALL OFFERS
A WONDERFUL ADDITION TO YOUR SLIDE RULES COLLECTION.
I ONLY ACCEPT PAYPAL AS A PAYMENT METHOD.
I SHIP WORLDWIDE.
INTERNATIONAL SHIPPING COST.WORLDWIDE............... USD 52UNITED STATES.......... USD 35
THE INTERNATIONAL SHIPPING SERVICE TAKES 25 / 40 DAYS TO ARRIVE, DEPENDING THE COUNTRY AND CITY.
USA BUYERS RECEIVE IN 10 / 15 DAYS WITH FEDEX.
THANKS FOR YOUR VISIT.
