Reprints of slide rule instructions, for the use of collectors, educators and students. All ephemera is currently archived in the International Slide Rule Museum Library. Instruction manuals, for the most part, are no longer available, Slide rule production ended in the mid 1970's and instruction manuals have deteriorated and are rapidly disappearing over time. The slide rule models themselves , now considered vintage math instruments, are still in abundance, and in the hands of private collections, museums, and many family homes. These volumes, organized by manufacturers, provide instructions for the most popular models, as well as some special designs. The scans from the faded and wrinkled manuals, have been "restored" digitally in order improve their clarity to provide decent black printing on white pages. All "noise", speckles, staple marks, etc., have been cleaned off the original scans, to improve the reader's experience. Where required, as in this volume, permissions have been obtained from manufacturers that are still in existence. British Instruction Books in Volume 13: Book 1 – Instructions for the Use of Boots RINGPLAN Slide Rules. Standard 10” and 5”. Book 2 – Instructions for the Use of Boots RINGPLAN 10” Log-Log Duplex Slide Rule. Book 3 – BRL (Blundell Harling) Comprehensive Slide Rule Instructions Book.. Book 4 – Classic Slide Rules. Instructions on their operation and use together with examples. Book 5 – The “Cooper” 100-inch Slide Rule. Designed for use in calculations involving multiplication, divisions, Logarithems, etc. Book 6 – “Davis-Scurfield” Slide Rule of 1909. The “Davfield”. Book 7– The Slide Rule Extended by Major-General Hannyngton of 1884 , and Galbreath's Description of the Hannyngton. Book 8 – How to use the HOPE No. 530 Trig Log Log Slide Rule. Book 9 – JAKAR Precision Slide Rules. Instructions for 11-55 Rietz, 22-77 Darmstadt, 66 Electro and 29 Student Log/Log. Book 10 – Key Electronics Nelson-Jones Slide Rule. For Electronic Engineers. Book 11 – Otis King's Calculator. (early 1921) Brief instructions for Model K L and N. Book 12 – Otis King's Calculator. (Carbic Ltd) Instructions for Model K and L. Book 13 – Book of Instructions for the P.I.C. Slide Rules, of 1928. Book 14 – Book of Instructions for the P.I.C. Slide Rules, of 1940, for the Standard, Reitz and Engineer's with Log-Log scales. Book 15 –Book of Instructions for the P.I.C. Differential Scale for Commercial Calculations. Book 16 – Sexton's Omnimeter Instructions. Theo. Alteneder & Sons of 1895. Book 17 – Instruction sheet for “Simplon” Slide Rules, Primary and Bilateral British Make models. Book 18 – Instruction Manual for the Emblem Series Slide Rules. Made by Uchido Yoko Co. for Technical Sales and the British market. Book 19 – The “Technical” Series of British Made Slide Rules. Comprehensive Book of Instructions.Book 20 – Edwind Thacher's Calculating Instrument or Cylindrical Slide Rule of 1884. Published by W.F Stanely, London.Book 21 –Thornton (Thornton-PIC) 10” Slide Rules, Instructions for use. Cover 241 and 271 and others.Book 22 – Unique Slide Rules “Half-Hour” Instructions.Book 23 – W.H. Harling Instructions for the Use of Slide Rules..