Mir Books

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Preface 8

Chapter One. AN OUTLINE OF TRANSFORMERS 9
1.1. Application of Transformers 9
1.2. Principle of Operation of the Transformer and Basic Definitions 11
1.3. Power Transformer Performance 16
1.4. Single- and Three-Phase Transformers 23
1.5. Circuit Symbols. Types and Phase-Displacement Groups of Transformer Winding Connections 27
1.6. Autotransformers 36
1.7. Specific Features of Some Special-Purpose Transformers 40
1.8. Operation of Power Transformers Under Actual Service Conditions 50
1.9. Voltage Control 56
1.10. Transformer Winding Arrangements for On-Load Tap Changing 62

Chapter Two. MATERIALS USED IN TRANSFORMERS 66
2.1. Properties of Insulating Materials 66
2.2. Insulating Materials Used in Transformer Repair Work 72
2.3. Conductor and Magnetic Materials 79
2.4. Auxiliary Materials Used When Repairing Transformers 82

Chapter Three. TRANSFORMER DESIGN 87
3.1. Classification and Designations 87
3.2. General Design of Transformers 90
3.3. The Transformer Core 91
3.4. The Windings 102
3.5. Tapping Switches (Tap-Changers) 117
3.6. The Leads 141
3.7. Terminal Bushings 146
3.8. Transformer Insulation 155
3.9. Transformer Tank, Coolers, Oil Conservator, Thermosiphon Filter, and Other Transformer Fittings 161
3.10. Protective Devices and Instruments 177

Chapter Four. ORGANIZATION OF REPAIR WORK 190
4.1. Types of Repair Work 190
4.2. Preparation for Repair and the Organization of Repair Work 192
4.3. Specific Features of Transformer Repair Work. Conditions of Opening Up the Transformer for Inspection 196

Chapter Five. MEDIUM TRANSFORMER REPAIR (INSPECTION) 200
5.1. Disassembling the Transformer 200
5.2. Repairing the Windings 205
5.3. Repairing the Core 210
5.4. Repairing the Tap-Changers and Leads 214
5.5. Repairing the Terminal Bushings 217
5.6. Repairing the Tank Cover and Installing the Terminal Bushings and Other Fittings on the Cover 220
5.7. Repairing the Tank, Oil Conservator, and Other Fittings Installed on the Tank Cover 222
5.8. Tanking the Core-Coil Assembly 226
5.9. Mounting the Oil Conservator, Buchholz Relay, and Other Fittings. Testing the Transformer for Leak Tightness 228

Chapter Six. MAJOR TRANSFORMER REPAIR (OVERHAUL) 232
6.1. Dismantling the Tap-Changer, Terminal Bushings, Tank Cover, and Leads 233
6.2. Dismantling the Top Yoke Clamps and Unblading the Top Yoke 234
6.3. Dismantling the Windings and Insulation. Inspecting the Core 237
6.4. Repairing the Core with Complete Disassembly 239
6.5. Repairing and Making the Windings 252
6.6. Repairing and Making the Major Insulation 257
6.7. Fitting the Insulation. Mounting and Packing Out the Windings 260
6.8. Specific Features of Mounting the Windings of Transformers for 110 to 220 kV 264
6.9. Re-Blading the Top Yoke. Clamping the Windings and the Top Yoke 269
6.10. Soldering, Welding, Insulating, and Fastening the Leads 272
6.11. Drying Out, Inspecting, and Assembling Transformers 282
6.12. Specific Features of Drying Out and Repairing Transformers for 110 kV and Upwards 290

Chapter Seven. DRYING OUT, PURIFYING, AND DEGASSING THE TRANSFORMER OIL 300
7.1. Cleaning the Oil of Moisture and Mechanical Impurities. Regenerating the Oil 300
7.2. Degassing the Transformer Oil 307

Chapter Eight. TRANSFORMER TESTING 309
8.1. Testing the Transformer Oil 310
8.2. Measuring the Insulation Resistance 313
8.3. Testing the Insulation 317
8.4. Determining the Transformation Ratio, Phase-Displacement Group of the Winding Connection, and D.C. Resistance of the Windings 320
8.5. Measuring the No-Load Current and the No-Load and Short-Circuit Losses 322
8.6. Determining the Insulation Characteristics 323

Bibliography 327
Index 328

Posted in books, engineering, mir books, mir publishers | Tagged electrical engineering, power transformers, power transmission, soviet literature, transformer design, transformer testing | Leave a comment

सोवियत स्कूली शिक्षा की समस्याएं – अ. माकारेंको (Problems Of Soviet School Education In Hindi by A. Makarenko)

Posted on September 1, 2026 by The Mitr

सोवियत शिक्षा और इसकी समस्याओं पर सोवियत शिक्षाशास्त्री ए. माकारेंको के निबंधों का संग्रह।
पेडागॉजिकल साइंस के उम्मीदवार वी. अरांस्की और ए. पिस्कुनोव द्वारा संकलित।
अनुवादक: राजवल्लभ ओझा।

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Posted in books, education, progress publishers | Tagged सोवियत साहित्य, problems of schools, soviet education, soviet literature, soviet schools, soviet teachers | Leave a comment

Mirrors Of Moscow by Louise Bryant

Posted on August 31, 2026 by The Mitr

“Mirrors of Moscow” by Louise Bryant is a collection of journalistic sketches and profiles that examines the political and social atmosphere of revolutionary Russia. Published in 1923, the book provides an insightful, though subjective, portrayal of the key figures and events that shaped Soviet Russia in the aftermath of the 1917 Revolution.

With five illustrations by Césare

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Contents

Foreword

Lenin and His Subordinates
Jacob Peters, Feodor S. Dzerzhinsky, and the Extraordinary Commission
Anatoly Vasilievich Lunacharsky and Russian Culture
Mikhail Ivanovich Kalinin and the Peasants
Madame Alexandra Kollontai and the Woman’s Movement
Leon Trotsky, Soviet Warlord
Enver Pasha and the Mohammedans
Tikhon and the Russian Church
Chicherin, Commissar for Foreign Affairs, and His Subordinates
Maxim Litvinov, Assistant Commissar
Leonid Krassin and Subordinates

Posted in books | Tagged biographies, historical sketches, october revolution, russian revolution, soviet literature, soviet society | Leave a comment

Stability And Oscillation Of Elastic Systems Modern Concepts, Paradoxes And Errors by Ya. G. Panovko; I. I. Gubanova

Posted on August 30, 2026 by The Mitr

This book discusses contemporary problems such as “jumps” in elastic systems, problems of aeroelasticity, problems of frictional self-oscillations, and self-synchronization, providing only the elementary data on these topics.

The first part examines the stability of equilibrium shapes in elastic systems. It addresses stability loss in cases of similar equilibrium shapes, the disappearance of stable equilibrium forms, and the absence of any equilibrium states. The error made by Euler in analysing stability loss is highlighted, and Mises’ truss is used as an example of stability loss in cases of similar equilibrium shapes.

The second part focuses on problems related to oscillations of linear systems, including systems with a fractional number of degrees of freedom, as well as the free oscillations of a cantilever in the field of centrifugal forces. Four methods for solving the problem of the action of periodic instantaneous impulses are presented. The Tacoma catastrophe is analysed as an example of aeroelastic oscillations.

Finally, the book explores problems of nonlinear system oscillations, including the vibration maintenance of rotation, the Sommerfeld effect, and self-oscillations of a quasi-system with dry friction.

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Foreword
Foreword to the First Edition …………………………………………….. v
Foreword to the Second Edition ……………………………………………. vi
Part 1: The Stability of Equilibrium Shapes of Elastic Systems
Introduction ………………………………………………………………….. 1

Chapter I: The Loss of Stability Upon the Appearance of Similar Equilibrium Shapes

§1. Euler’s Error ……………………………………………………………………. 5
§2. The Effect of Subcritical Compression of a Bar on the Critical Value of the Compressive Force …. 11
§3. One Version of the Application of the Energy Method ………………………. 17
§4. Loads Whose Values Depend on the Displacements ………………………….. 22
Chapter II: Loss of Stability Upon the Appearance of Non-Similar Equilibrium Shapes

§5. The Mises’ Truss ………………………………………………………………… 43
§6. The Stability of a Fluted Strip ………………………………………………….. 51
§7. More Examples of Systems with Jumps; Discussion of the Results …………. 58
Chapter III: Stability Loss Upon the Disappearance of Stable Equilibrium Shapes

§8. Tracking Loads: Static Statement of the Problem …………………………. 70
§9. Tracking Loads: Dynamic Statement of the Problem …………………….. 80
§10. Tracking Loads: A System with Two Degrees of Freedom ………………… 87
§11. The History of the Problem …………………………………………………… 91
Chapter IV: Stability Losses When Any Forms of Equilibrium Disappear

§12. General Stability of High Buildings ………………………………………… 97
§13. Characteristics of “Deformation Calculations” …………………………….. 104
§14. Two Discussions (Solutions of R. Lorenz and V. E. Vlasov) ……………….. 113
§15. Stability Losses of a Rod Under Tension …………………………………. 125
§16. Critical Internal Pressure for a Spherical Shell ……………………………. 136
§17. Rotation of a Flexible Shaft in a Rigid Tube-Shell ………………………… 140
Chapter V: Buckling of Not Fully Elastic Rods

§18. Elastic-Plastic Buckling: Classical Concept ……………………………….. 153
§19. Elastic-Plastic Buckling: Present-Day Concept ……………………………. 160
§20. Buckling of a Rod in a Statically Indeterminate System …………………. 167
§21. Stability Loss in the Case of Material Creep ……………………………….. 175
Part 2: Oscillations of Elastic Systems
Introduction …………………………………………………………………… 184

Chapter VI: Certain Problems of Oscillations of Linear Systems

§22. System with a Fractional Number of Degrees of Freedom ………………. 187

§23. Free Oscillations of a Cantilever in the Field of Centrifugal Forces ………. 192

§24. Equal-Frequency Shock Absorber ……………………………………………. 197

§25. Comments on the Formulas of Rayleigh and Grammel ……………………… 201

§26. Lagrange Errors ………………………………………………………………. 214

§27. Formula of A. N. Krylov ………………………………………………………. 224

§28. Four Methods of Solving the Problem of the Action of Periodic Instantaneous Impulses …….. 233

§29. Superpositions: Variations of Using It in Problems of Forced Oscillations … 244

§30. The “Inverse” Form of Differential Equations of Oscillations ……………. 252

§31. Terminology Information: Impedance, Receptance, Admittance, Response, Anti-Resonance …. 259

§32. Parametric Excitation of Oscillations ……………………………………… 269

§33. Destabilizing Action of the Forces of Viscous Friction …………………….. 285

§34. Linear Realisations of Dry Friction Forces …………………………………. 292

§35. Paradox Connected with Damping Coverings ……………………………… 302

§36. Damping of Pipeline Oscillations by Coriolis Forces ………………………. 309

Chapter VII: Dynamic Action of a Moving Load

§37. Brief Historical Sketch ……………………………………………………… 314
§38. Bresse Error ……………………………………………………………………… 322
§39. A Travelling Bending Wave …………………………………………………….. 327
§40. Action of an Infinite Strip of a Moving Load ………………………………. 332
Chapter VIII: Aeroelastic Oscillations

§41. Dynamic Problems of Aeroelasticity Theory ……………………………….. 338
§42. “Classical” Flutter ………………………………………………………………. 341
§43. Tacoma Catastrophe: Separation Flutter …………………………………… 351
Chapter IX: Problems of Nonlinear System Oscillations

§44. Vibration Maintenance of Rotation …………………………………………. 358
§45. Dynamics of the Boisse-Sarda Regulator …………………………………… 365
§46. Sommerfeld Effect ………………………………………………………………… 372
§47. Self-Oscillations: Method of Slowly Changing Amplitudes ……………….. 383
§48. Self-Oscillations of a Quasi-System with Dry Friction …………………… 393
§49. Discontinuous Self-Oscillations in the Case of Dry Friction ……………. 400
§50. Delta Method ……………………………………………………………………… 406

Posted in books | Tagged dynamics, elastic systems, errors, oscillating systems, oscillations, physics, soviet literature, stability | Leave a comment

भौतिक विज्ञान सहज बोध (Physics For Entertainment In Hindi ) by या. इ. पेरेलमान (Yakov Perelman)

Posted on August 29, 2026 by The Mitr

विश्वविख्यात भौतिक विज्ञानी या. इ. पेरेलमान की कृति महत्त्वपूर्ण पुस्तक ‘Physics for Entertainment’ का अनुवाद

बी.एस.के. काले

अनुवादक देवेन्द्र प्र. शर्मा

Many thanks to @life123 for scans

Note: There is slight warping on some pages but the print is very clear and readable

You can get the book here and here

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Posted in books, children's books, children's science | Tagged mechanics, physics, physics problems, physics puzzles, popular science, soviet literature | Leave a comment

मनोरंजक खगोलशास्त्र (Astronomy For Entertainment In Marathi) by याकोव पेरलमन (Yakov Perelman)

Posted on August 28, 2026 by The Mitr

Yakov Perelman’s Astronomy for Entertainment introduces readers to the fascinating world of astronomy, focusing on its daily, foundational aspects rather than advanced discoveries. The book aims to make astronomy accessible, avoiding technical jargon and instead presenting ordinary facts in imaginative ways to spark curiosity. It is not a textbook but a creative exploration of basic astronomical phenomena, designed to engage even those unfamiliar with the subject. While some calculations are included, they are simple and within the grasp of anyone with basic school-level mathematics, helping readers to better understand and retain their learning.

The book covers topics such as the Earth, the Moon, planets, stars, and gravitation, highlighting lesser-known aspects often overlooked in similar works. Perelman had planned a second volume to expand on these ideas, but his untimely death during the Siege of Leningrad in 1942 prevented its completion. Minor updates were later made to this volume to keep it relevant. Despite its unfinished nature, the book remains a unique and engaging introduction to astronomy.

याकोव पेरलमन यांचे मनोरंजक खगोलशास्त्र पुस्तक खगोलशास्त्राच्या आकर्षक जगात वाचकांना घेऊन जाते आणि त्यात प्रगत शोधांऐवजी या विज्ञानाच्या मूलभूत, दैनंदिन बाजूवर लक्ष केंद्रित केले आहे. हे पुस्तक खगोलशास्त्र सर्वांपर्यंत पोहोचवण्याचा प्रयत्न करते, जिथे तांत्रिक शब्दसंग्रह टाळण्यात आला आहे आणि रोजच्या घटनांना वेगळ्या, कल्पनाशील दृष्टीकोनातून मांडले गेले आहे. हे पाठ्यपुस्तक नाही, परंतु खगोलशास्त्राशी संबंधित साध्या घटनांवर आधारित सर्जनशील चर्चा आहे. वाचकांना अधिक चांगल्या प्रकारे समजून घेण्यासाठी आणि शिकलेले लक्षात ठेवण्यासाठी, पुस्तकात शालेय पातळीच्या गणिताच्या सोप्या आकडेमोडींचा समावेश केला आहे.

पुस्तक पृथ्वी, चंद्र, ग्रह, तारे आणि गुरुत्वाकर्षण यासारख्या विषयांवर आधारित आहे, आणि सहसा दुर्लक्षित विषयांना अधोरेखित करते. पेरलमन यांनी यातील संकल्पना पुढे नेण्यासाठी दुसऱ्या खंडाचे नियोजन केले होते, परंतु १९४२ मध्ये लेनिनग्राडवरील युद्धादरम्यान त्यांच्या अकाली निधनामुळे ते अपूर्ण राहिले. नंतर या खंडात काही बदल केले गेले, जेणेकरून हे पुस्तक अद्ययावत राहील. जरी हे अपूर्ण असले तरी, खगोलशास्त्रातील प्राथमिक गोष्टी शिकवण्यासाठी ते अद्वितीय आणि आकर्षक साधन राहिले आहे.

Many thanks @life123 for the scans

मराठी अनुवाद प्र.पा. संझगिरी

Note: There is slight warping on some pages, but the print is very clear and readable.

You can get the book here and here

Bluesky https://bsky.app/profile/mirtitles.bsky.social

Internet Archive https://archive.org/details/mir-titles

Fork us on gitlab https://gitlab.com/mirtitles

Posted in astronomy, books | Tagged earth, mathematics, navigation, planets, popular astronomy, popular science, soviet literature, stars | Leave a comment

మబ్బుమీద స్వారి (A Fly On A Cloud In Telugu ) by యం. ప్లాత్స్కప్స్కియ్ (M. Plyatskovsky)

Posted on August 27, 2026 by The Mitr

A picture story book for children.
బాలల కోసం చిత్ర కథల పుస్తకం.

చిత్రాలు: వి. చీజికొవ్

అనువాదం: రాచమల్లు రామచంద్రారెడ్డి

You can get the book here and here

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Posted in books, children's books, children's stories | Tagged children's books, illustrated books, soviet literature, story books | Leave a comment

రెండు కథలు (Two Tales Of Pencil And Paint In Telugu) by వ్లాదీమిర్ సుతేయెవ్ (V. Suteev)

Posted on August 26, 2026 by The Mitr

A picture story book for children.
బాలల కోసం చిత్ర కథల పుస్తకం.

రెండు కథలు
చిత్రాలు రచయితవి రష్యన్ భాషనుండి అనువాదం

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Posted in books, children's books | Tagged children's books, illustrated books, soviet literature, story books | Leave a comment

మాప, ఎలుగుబంటీ (Masha And The Bear In Telugu)

Posted on August 25, 2026 by The Mitr

A picture story book for children.
బాలల కోసం చిత్ర కథల పుస్తకం.

అనువాదం: అట్టేరి కుప్పురాజులు

You can get the book here and here

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Posted in books, children's books | Tagged children's books, illustrated books, soviet literature, story books | Leave a comment

Three Paces Beyond The Horizon ( Outstanding Soviet Scientists) by V. Lysenko (Ed.)

Posted on August 24, 2026 by The Mitr

A book describing personalities and of the Soviet space programme their contributions.
Translated from the Russian
by G. G. Egorov

You can get the book here and here

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