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Exotic Slide Rules Oversize 20" Rules, Accessories & Magnifiers, Unusual Applications 
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Sphere Research Corporation 3394 Sunnyside Rd. West Kelowna, BC, Canada V1Z 2V4 Phone: +1 (250) 769-1834 A great source for test equipment, repairs, calibrations, useful metrology information, and of course, SLIDE RULES!  Want something? e-mail us!Our FAQ !! Answers to all those questions.Visit our amazing document server. Quotes & SciFi to Ethics & Business.Just  SCROLL DOWN to see everything! |
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Welcome to the Slide Rule Universe! |  |
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NIB Rules |
NIB Pickett Rules |
Pocket Rules |
Circular Rules |
 FREE stuff! |
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and even some other things...      Skip the INTRO, Go RIGHT to the CATALOG! To make your life easier, and help you find exactly what you want, we have broken the on-line slide rule catalogs into smaller sections. Just CLICK on the icon of the rule type you are looking for at the left, to see the matching catalog. Large graphical catalogs are a bit SLOW, please give them time to load.
You can order anything here just by picking up the phone, and calling (250) 769-1834 during normal office hours, 8:30AM to 4:30PM PST. OR, Email your order to Susan  SHIPPING: Preferred and Alternate Methods as of June 4, 2013, CLICK for FULL DETAILS ON OUR FAQ Page. Rates are now changing rapidy, often with little notice to us, so all the data has been transferred to the FAQ page for speedy updating. E-Mail Susan if you want a quote for shipping to other destinations, or for something heavy. Sorry, we can't safely send most individual small parts in a regular letter envelope, they get destroyed by the automated handling equipment. Sometimes we can ship very rugged parts in a small padded envelope by letter post. Ask Susan.If we have your valid data on file, you can just click on the ORDER email link to place an order and indicate your approval to bill, and we will do the rest. We keep your active information for ONE YEAR for your convenience.If this is the first time you have dealt with us, you can phone +1 (250) 769-1834 to supply the billing info, or send it by the email link, as you prefer. We accept VISA/MC, international money order, Paypal (to Susan@Okanagan.net), and bank wire transfer. Please note that there are transaction fees with Paypal and wire transfer payments, the wire transfer fee is frankly horrifying.
 The CATALOG will appear below shortly! |
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JUST SCROLL DOWN TO SEE EVERYTHING !We have some additional 20 inch rules available, PLEASE EMAIL us for details if you are interested.
 Aristo 101 Projection Rule 
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Aristo 101 Projection Rule  Click for bigger PIC! Special Purpose overhead projection rule, for class instruction The 101 performs like the Aristo Junior, excellent for basic rule instruction (no trig or log functions). Rare and hard to find, this is brand new in the factory box complete with the manual. Self-contained rule operating instructions in German and English. (Unusual 12 Scales) Front - DF, [ CF, CIF, CI, C, ] D, A, K Back - mm, [ mm, A (partial), ] B |
 $349 Like this rule? CLICK TO ORDER |
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FLOW RULE  Click for bigger PIC!  Click for Back View! 
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12.5"/10" Special Purpose Full Size Slide Rule This NEW, special late production Foxboro flow rule is used to calculate flow parameters and rates for liquids, steam or gas. This is the version custom made for Foxboro by Hemmi of Japan, and has red, blue and black engraved and filled scales. Pipe schedules are color coded for easy operation. The unusual design uses many dedicated scales sets on both sides, and includes the fitted factory box and manual, and gold embossed leather case, all in MINT condition!. It's a rule you will really enjoy in your collection, or on the job doing steam or hydraulic pipe fitting. We have a second new rule and case, no box or manual, $245 |
$295 Like this rule? CLICK TO ORDER |
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 Hemmi/Sun Early 257 Chemical Engineering 10" Duplex Rule  CLICK for BIGGER PIC
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This is one of the most fascinating and highly requested rules from Hemmi, and is the first version of this rule, with a slightly different scale set than the later 257L (257 has no K scale, and a different pressure scale arrangement, a very rare animal! This rule solves a wide range of chemical and pressure/temperature problems. 12" / 10" Advanced Chemical Engineering Duplex Slide Rule (Unusual 23 Scales !!) Front - L, A, DF, [ CF, CIF, CI, C, ] D, LL3, LL2, LL1 Back - Ch a-m, Ch n-z, M1, [ M2, degrees F, degrees C, degrees K, F(t), ] Kg/cm2, mmHg, in Hg vac, tw 
Want to know more about our NEW SPHERE CASES? JUST CLICK HERE! |
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Hemmi/Sun Early 257L Chemical Engineering 10" Duplex Rule  CLICK for BIGGER PIC
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This is a very late production version of one of Hemmi's highly requested Chemical Rules, with the added K scale. This rule solves a wide range of chemical and pressure/temperature problems. 12" / 10" Advanced Chemical Engineering Duplex Slide Rule NEW, powerful classic Bamboo duplex rules, in Hemmi's final version (plastic) leatherette case. Complete with a HEMMI MANUAL, very hard to find. These rules were not seen in North America often (quite unfortunate), but provide a wealth of specialized chemical calculations, including atomic weight, temperature/pressure, factor conversion and a full function rule on the reverse. Very impressive and unique rule, with self-documenting special purpose scales. We only have one of these rare final rules available, so don't miss your chance! New and in mint condition, it looks fantastic! (Unusual 24 Scales !!) RH Front - L, K, A, DF, [ CF, CIF, CI, C, ] D, LL3, LL2, LL1 Back - Ch a-m, Ch n-z, M1, [ M2, degrees F, degrees C, degrees K, LM, ] mmHg, Kg/cm2, in Hg vac, tw |
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Hemmi/Sun 266 Electronic Engineering 10" Duplex Rules  CLICK for BIGGER PIC
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This is the most requested rule from Hemmi. Solves everything from parallel resistance to resonant frequency 12" / 10" Advanced Electronic Engineering Duplex Slide Rule (Unusual 24/26 Scales !!) Front - LL3', LL2', LL1', LL2, A, [ B, BI, CI, C, ] D, dB/L, S, T Back - XL, Xc, F, T1, [ T2, L, Cf, Cz, ] L, Z, fo, lambda |
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Cylindrical Slide Rule 
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Very Good used Otis King Model K Boxed Set!
Otis King Model K boxed set. This has scales 423 and 414A wonderful set with original factory box (serial number V3940), made in England. This is the unique cylindrical rule with telescoping scales, complete with the original black storage box. Everything is in very good condition. This rule has the equivalent of a 66 inch scale, with resulting incredible resolution! We see very few of these sets. The box shows the faint imprint of an owner's name -Devonport-, visible on the pic at left, a faint name -G E Swift- is visible on the black body, but is hard to see on the rule, and can't really be photographed. Want to know more about these? Look HERE and HERE for on line tutorials on these rules. You can also get a zipped manual reprint HERE from Greg.
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Model K Like this set? CLICK TO ORDER |
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10 Inch  Click for Bigger PIC!
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13 rod Chinese Abacus light finished frame construction, with black beads. 10 inches wide, 4.5 inches tall. Brass reinforced corners, not as well finished as the Peony abacus we had earlier, but a good starter abacus for students. FOR INSTRUCTIONS, visit the excellent Abacus page at Ryerson:  13 Rods 5/2 bead style |
 Save $4 $26 Like these? CLICK TO ORDER |
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 N4133S 8 Inch Roylance Electrical Rule  CLICK for bigger PIC!  CLICK for bigger PIC!  CLICK for bigger PIC!  CLICK for bigger PIC! |
 CLICK for bigger PIC! 8" Roylance Electrical Slide Rule K+E N4133S. This is one of the very few catalog special purpose rules made by K+E. This was designed to be both a general purpose rule, and a replacement for wire and electrical tables for working electrical engineers. This is a short format 8 inch mahogany rule (usually designated with a -2 suffix), and is one of the very few K+E rules with a multi-line cursor for area of a circle calculations. The top edge is an inch ruler, the back has conversion factors, plus a sight window for the rear slide scales. The set includes a very good condition, unmarked sewn leather case. The rule has special gauge marks, and bottom edge and interior scales for electrical wire gauge calculations. Serial number is 528207. (11 Scales and inch ruler) Front - inch/ A, [ B, CI, C, ] D, K | wire gauge Reverse - conversion factors [ S, L, T ] Inside - [ wire gauge ] |
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Load Adjuster Rule |
12.5"/10" Special Purpose Full Size Slide Rule Another excellent design from Cox and Stevens (the makers of the famous Foxboro Flow Rule), for loading and operating the KC-135A aircraft. It also has scales inside the body, and seating chart on the reverse, with abbreviated operating instructions on the scale areas. A very unique and visually appealing rule, it has a perfect cursor, rule and case are in excellent condition. The body appears to be made of black plastic like nylon or delrin, with laminated scales in white, yellow, black and red. (18 Major Scales, numerous minor scales, internal chart and rear diagram) |
Like this rule? CLICK TO ORDER |
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Load Adjuster Rule |
12.5"/10" Special Purpose Full Size Slide Rule Another excellent design from Cox and Stevens (the makers of the famous Foxboro Flow Rule), for loading and operating the C-118A. It also has scales inside the body, and seating chart on the reverse, with abbreviated operating instructions on the scale areas. A very unique and visually appealing rule, it has a perfect cursor, is in excellent condtion, but has no case. The body appears to be made of black plastic like nylon or delrin, with laminated scales in white, black and red. (14 Major Scales, internal chart and rear diagram) |
Like this rule? CLICK TO ORDER |
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Pipe Size Computer  CLICK for bigger PIC!  CLICK for bigger PIC! |
Keating Pipe Size Computer 8" gold anodized aluminum rule, with 4 special scales for pipe sizing. Excellent condition, a very unique rule in both purpose and appearance. Instructions are on the rear of the rule, and show both operation and special factors for pipe bends and T-connections. Includes gold embossed brown vinyl slip case. (4 Scales and instructions) Front - Pressure Drop, [ Length, Diameter, ] Gas Reverse - Equivalents, Instructions |
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Weight Slide Rule  CLICK for bigger PIC! 
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Novotni Weight Slide Rule 13.5" paper and wood rule, in original box with manual. Very good condition, used to quickly calculate the weight of common metal shapes and sizes, very useful in metal fabricating work, and costing. The Novotni rule is one of the best examples of a fixed purpose slide rule, optimized for industry. This is an early rule from the maker. Some early owners of this rule had their names written inside the rule body, SEE DETAILS HERE. |
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105mm Howitzer Rules  CLICK for bigger PIC!
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3ea. 16 Inch Rules! 16" Wood rules with plastic cursors, complete with the green nylon carrying bag. Perfect for that home defence 105mm Howitzer you bought last week, allows easy set up of loads, angles and target distances. Numerous marks, pen markings, some cosmetic blemishes, clearly these have been used for real. |
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Steel Composition Rule  CLICK for bigger PIC! |
16 Inch Rule! 16" Stainless steel over mahogany core typesetting/composition rule. Used for graphical layout, has reduction/enlargement functions, type sizing, and multiple rulers on both sides. Also works as a regular slide rule, with A/B/C scales. Extensive documentation on rear side. All markings are deep etched into the stainless surface, a very attractive and useful rule for the art prep table. |
Like this rule? CLICK TO ORDER |
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REACTANCE SLIDE RULE  Click for bigger PIC! |
8" Special Purpose Reactance Slide Rule The most famous Perrygraf ever made, complete with manual and slip case. Both sides are shown in the pic, only 1 rule is supplied, cardboard construction. Excellent condition. Solves for inductive and capacitive reactance, D, Q and resonant frequency, an incredibly useful tool! Self documenting on both sides, with full instructions. We get requests for this all the time, just got some more in. They may be different colors than show, depending on printing date. (18 Scales, and instructions) |
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.303 Machine Gun Mk. IV Slide Rule For MKVIII Ammo |
8" Heavy Aluminum (0ver synthetic body) Slide Rule for the Vickers .303 Mk. IV Machine Gune. An amazing leftover from WW2, copyright 1944, by the R. E. Co, Ltd. An extemely complex rule, with two side body scales for map reading, two double sided slides, and data on both faces, plus a calibrated 24 inch cord. Just what you need for that quite afternoon out on the shooting range. Converts 'meteres' to yards, factors in wind, elevation, range and something mysterious called clock rays, to determine the set up of the machine gun. In very good condition! (9 Scales, two map rulers, data charts and calibrated string) |
Like this rule? CLICK TO ORDER |
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Equipment Co. Human Metabolic Rate Rule |
11" Heavy Aluminum and Steel Slide Rule for calculating Human Metabolic rate information A very bizarre rule with 2 steel slides in a heavy gold anodized aluminum sleeve, it works with body weights from 40 to 400 pounds. Very good condition, includes simple cloth carrying case (some stains and marks). It has individual scale settings for men and women, and factors in age, sex, time to consume a stadard liter of oxygen, height and gives percent deviation of standard metabolic rate. I think..... (5 Scales) |
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VALVE SIZING RULE  Click for bigger PIC!  Click for Back View! |
12.5"/10" Special Purpose Pocket Size Slide Rule One of Foxboro's later special rules for hydraulic work, it's used to calculate flow parameters and valves for liquids, steam or gas. Excellent condition. Like other Foxboro rules, this plastic body rule uses even the body cavity for scales. Comes with a gold embossed, black leatherette case. Self documenting on the rear, with full instructions. (15 Scales, and rear instructions) |
Like this rule? CLICK TO ORDER |
| VISIT OTHER CATALOGS: |
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Buy a slide rule from our extensive on line marketplace, with restored classics, amazing new in the box rules, and low cost first student rules. We have something for everybody, even a swap and sell area for visitors. |
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Learn to operate and care for your slide rule with these on line manuals and directions. Learn what scales mean, how to use them and how to restore or keep your rule in good condition. |
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Visit other slide rule places on the web with more slide rule data and information. From personal collections on line to (yes, it's really true) the international slide rule owners and collectors organization, the Oughtred Society. |
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