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**TEACH YOURSELF THE SLIDE RULE**

The "Teach Yourself ..." series of books (still published today by Hodder Stoughton) will be familiar to any British reader. One of their titles was "Teach Yourself the Slide Rule" by Burns Snodgrass M.B.E, A.R.C.Sc.. The author had founded the Unique Slide Rule Company in 1920. The book was published in 1954, the year of his death. The company was subsequently managed by his son. Given the provenance of the author, it is not surprising that the book concentrates on Unique slide rules. However since the company produced a wide range of rules it made a very comprehensive book.

The book was originally published by "The English Universities Press Ltd". The copyright is now held by "Hodder Stoughton", to whom I am grateful for permission to scan parts of the book and put them on this web site.

The following is the original list of contents. From those sections with hyperlinks you can see which of them have been scanned (at least in part) and added to my site. I should add that I have not simply scanned the pages and put them on the site as a graphics images but have interpreted them by Optical Character Recognition. The advantage of this is that the files are smaller than the original graphics image and can be more easily printed. The disadvantage, but only for me, is that it is more labour intensive. I have also at times modified the format (for example moving lists of slide movements into tables). As an Engineer married to an English graduate, I have been made aware that not only do engineers sometime use language in an idiosyncratic way but they are not always consistent in their use of language; this was case with Burns Snodgrass. I have not tried to improve his English nor add consistency (for example, descriptions of slide movements are sometimes given on separate lines and sometimes run together and separated by commas).

The figures were taken from the original book; they often showed the two ends of a rule split over two pages.

**Contents**

SECTION 1. THE PRINCIPLE OF THE SLIDE RULE

Linear and non-linear scales - numbering of the scales - reading the scales -
multiplication and division of simple numbers.

SECTION 2. FRACTIONS-DECIMALS

Fractions, addition and subtraction - Multiplication and division - Decimals, Conversion
of Decimal Fractions into ordinary Fractions - Addition and Subtraction - Multiplication
and Division - Contracted methods - Conversion of ordinary Fractions into Decimal
Fractions - Recurring Decimals - Conversion of Recurring Decimals into ordinary Fractions.

SECTION 3. THE MODERN SLIDE RULE

Protection of the Slide Rule - Component parts - C & D Scales - A & B Scales - Log
Scale - The Cursor - Linear Scales.

SECTION 4. C & D SCALES

Multiplication - Division - Multiplication and Division combined - Position of a Decimal
Point.

SECTION 5. A & B SCALES

Squares and Square Roots - Cubes and Cube Roots - Cube Scale.

SECTION 6. LOG LOG SCALES

Evaluation of Powers and Roots - Common Logarithms - Natural Logarithms.

SECTION 7. THE TRIGONOMETRICAL SCALES

Sine Scale - Tangent Scale - Solution of Triangles - Navigational Problems -
Navigational Units and Formulae - Wind and Drift Problems - Interception Problems -
Calculation of True Track and Distance.

SECTION 8. THE COMMERCIAL RULE

The Special Commercial Scales-Money Calculations - Discount Scale - The Monetary Rule -
£.s.d. Scales - Invoicing calculations.

SECTION 9. THE PRECISION RULE

The Special C & D Scales - Multiplication - Division - Determining in which scale lies
the answer.

SECTION 10. THE ELECTRICAL RULE

Dynamo and Motor Efficiencies - Volt Drop - Duplicate C & D Scales - Reciprocal Scale
- Time Saving.

SECTION 11. THE DUALISTIC RULE

Duplicated C & D Scales - Special 20" Scales for ordinary calculations - Squares
and Square Roots - Cubes and Cube Roots - Log Log Scales.

SECTION 12. THE BRIGHTON RULE

The ordinary Scales - Log Log Scales - Sine & Tan Scales - Cube Scale - Log Scale.

SECTION 13. INDICES & LOGARITHMS

Indices - Multiplication and Division - Logarithms - Reading Log Tables - Multiplication
and Division - All Bilogarithms - Powers and Roots - Logarithms with Negative
Characteristics - Tables of Logarithms and Antilogarithms.

SECTION 14. OTHER CALCULATING INSTRUMENTS

Cylindrical Calculators - Circular Calculators - Watch type Calculators - Other Rules.

SECTION 15. HISTORICAL NOTE

Invention of the Slide Rules - Degree of Accuracy - Common Gauge Points - Marking Special
Gauge Points.

SECTION 16. EXERCISES

Commerce - Energy and Power - Friction and Heat - Strength and Deflection of Beams -
Strength of Shafts and Deflection of Springs - Electricity - Building - Surveying -
Navigation - Miscellaneous.

© Hodder Stoughton, reproduced with permission.

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