- Oct 2024
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www.ebay.com www.ebay.com
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https://www.ebay.com/b/barnett-jaffe-slide-case/bn_7024798534
Barnett & Jaffe made tweed cases in the mid-century for carrying around several drawers of 35mm slides.
These could potentially be repurposed as portable zettelkasten.
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- Jan 2024
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www.mccoys-kecatalogs.com www.mccoys-kecatalogs.com
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Presuming my 1956 dating for my 4181-3 (SN 004365) slide rule is correct, the 1956 price list has the 10 inch ivorite 4181-3 model for $15.00.
https://www.mccoys-kecatalogs.com/KECatalogs/1954/1956Price/1956kecatprice43.htm
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www.mccoys-kecatalogs.com www.mccoys-kecatalogs.com
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www.mccoys-kecatalogs.com www.mccoys-kecatalogs.com
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1956 --- The ST scale on rules that had Decimal Trig scales were converted to an SRT scale.
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1956 0 88,500 88,500
My 4181-3 slide rule was likely manufactured in 1956 as it has the SRT scale initiated in 1955 and has a serial number 004365 which is in the series 3 segment which reset in 1956 and ran from 0 to 88,500 that year.
https://www.mccoys-kecatalogs.com/keserialnumbers/Dating-2.htm
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www.mccoys-kecatalogs.com www.mccoys-kecatalogs.com
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www.mccoys-kecatalogs.com www.mccoys-kecatalogs.com
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www.mccoys-kecatalogs.com www.mccoys-kecatalogs.com
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1955b - The scale set was changed. ST scale was changed to SRT on the 4081s only.
My 4181-3 was likely made in 1955 or after as it has the SRT and not the ST scale. (It has a 1947 copyright mark on it.)
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1955b (4081-3, 4081-5, 4181-1, 4181-1C, E4181J, 4181-3, 68 1200, 68 1205, 68 1210, 68 1215, 68 1220, 68 1251, 68 1256, 68 1261, 68 1282, & 68 1287) Scale sets: Front: LL02 LL03 DF = CF CIF CI C = D LL3 LL2 Rear: LL01 L K A = B T SRT S = D DI LL1
These are the scale sets on my K+E 4181-3 slide Rule
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www.mccoys-kecatalogs.com www.mccoys-kecatalogs.com
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4181-3 10" Log Log Duplex Decitrig Plastic 4081-3 family
The Keuffel & Esser 4181-3 was part of the 4081-3 family and was described in their catalogs as a 10 inch Log Log Duplex Decitrig Plastic slide rule.
via https://www.mccoys-kecatalogs.com/KEModels/kexrefmain.htm
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Either index may be used.
If the numbers to be multiplied result in the hairline not being able to be used because the reading is off one side of the slide rule, then use the second index (the number 1) on the D scale.
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To find the product of two numbers, disregard the decimalpoints, opposite either of the numbers on the D scale set the index ofthe C scale, push the hairline of the indicator to the second numberon the C scale, and read the answer under the hairline of the D scale.The decimal point is placed in accordance with the result of a roughcalculation.
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Definitions. The central sliding part of the rule is called theslide, the other part the body. The glass runner is called the indi-cator and the line on the indicator is referred to as the hairline.
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Kells, Lyman M., Willis F. Kern, and James R. Bland. K+E Slide Rules: A Self Instruction Manual. New York: Keuffel & Esser Co., 1955.
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Accuracy of the slide rule. From thediscussion of § 2 it appears that we read fourfigures of a result on one part of the scaleand three figures on the remaining part.Assuming that the error of a reading is onetenth of the smallest interval following theleft-hand index of D, we conclude that theerror is roughly 1 in 1000 or one tenth of oneper cent. The effect of the assumed errorin judging a distance is inversely propor-tional to the length of the rule. Hencewe associate with a 10-inch slide rule anerror of one tenth of one per cent, with a20-inch slide rule an error of one twentiethof one per cent or 1 part in 2000, and withthe Thacher Cylindrical slide rule an errorof a hundredth of one per cent or one part.in 10,000. The accuracy obtainable withthe 10-inch slide rule is sufficient for manypractical purposes; in any ease the sliderule result serves as a check.
The accuracy of most 10 inch slide rules is approximately 1 in 1000 or one tenth of one percent.
Because the error in approximating distance is inversely proportion to the length of a slide rule, longer slide rules will have proportionally smaller errors, so while a 10 inch slide rule has an error of 1 in 1000, a 20 inch will have an error of 1 in 2000 and larger rules can be accurate to within 1 in 10,000 or better.
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K-E Keuffel & Esser Slide Rule Model 4181-3 & Leather Case
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- Aug 2023
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www.reddit.com www.reddit.com
- Feb 2023
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drive.google.com drive.google.comview1
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Liquidity ratios are financial ratios that measure a company's ability to meet its short-term obligations or current liabilities using its current assets. These ratios help assess a company's liquidity and ability to cover its short-term debts, and they are important indicators of a company's financial health
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- Aug 2022
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www.youtube.com www.youtube.comYouTube1
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slide through them as if they are paper cards lying on your desk
这个描述很准确，像是桌面上的纸卡层叠放置。
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- Mar 2022
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www.sliderulemuseum.com www.sliderulemuseum.com
- Feb 2019
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static1.squarespace.com static1.squarespace.com
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www.youtube.com www.youtube.com
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Project 46 - Slide
Jacob recommends Project 46 - Slide for anyone that likes House.
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