U.S. 5 per cent. bonds, Philadelphia and city loans, R. R. bonds, 186,621.12 64,981.74 $1,148,679.74 $6,958,354.75 bank, and other stocks, worth.. $2,941,783.50 Mortgages, first liens on properties worth... .$6,217,760.00 Premium notes, secured by policies.... Home Office, and Real estate bought to secure loans. Loans on collaterals, etc.. Cash on hand and in Trust Companies.. Net ledger assets as above....... Net deferred and unreported premiums. Market value of stocks, etc., over cost. Gross assets, January 1st, 1881....... LIABILITIES. .$101,444.13 12 Mo, Limp Vellum Cloth, Illustrated. Price, 80 cents. FOUR LECTURES ON Static Electric Induction, BY J. E. H. GORDON, B. A. CONTENTS. LECTURE I. Introductory Preliminary Experiments, Conductors and Insulators Induction, Mechanical Illustration. LECTURE II. Leyden Jar, Residual Charge, Mechanical Experiment, Hopkinson's Experiment, Faraday's Study of Induction, Theory of Lateral Pressure, Delarue's Lateral Pressure in Vacuum Tubes. LECTURE III. Faraday's Measurements and his Results, Recent Measurements and Experimental Details, Table of Results. LECTURE IV. Specific Inductive Capacities of Gases, Clerk Maxwell's ElectroMagnetic Theory of Light, Electric Induction and Velocity of Light, Table of Velocities, Actions of Electricity on Light, Electro-Magnetic Action on Polarized Light, Electro-static on Polarized Light, discovered by Dr. Kerr, Effect of Light on Seleniun, Etc., Etc. ** D. VAN NOSTRAND, Publisher, 23 Murray and 27 Warren Streets, NEW YORK. Copies sent by mail, post paid, on receipt of price. 12mo. Cloth Extra. 210 Pages, 74 Illustrations. $2.00. PRACTICAL BLOWPIPE ASSAYING. BY GEORGE ATTWOOD. CONTENTS. PART I. Description of the Mouth Blow-pipe and Apparatus. The Blow-pipe-How to Use-Fuel-Lamps-Flames-Supports, Weighing Instruments -Tools, Small Implements and Apparatus-Batéa-Reagents, Dry and Wet-Test or Proof Metals. PART II. Qualitative Determination. Colors of Sublimates on Charcoal-Potassium-Sodium-Cesium-Rubidium-Barium -Strontium-Calcium-Magnesium-Aluminium-Manganese-Tin-Antimony-SilverGold-Chromium-Iron-Cobalt-Nickel-Zinc-Cadmium-Copper-Lead — IndiumBismuth-Titanium - Mercury-Platinum-Lithium-Oxygen- Hydrogen - NitrogenFluorine-Chlorine-Bromine-Iodine-Sulphur-Phosphorus-Arsenic-Carbon-Boron -Silicum-Glucinum-Lanthanum-Yttrium-Terbium-Tantalum -Uranium-Tungsten -Vanedium-Palladium-Ruthenium-Cerium-Didymium-Erbium-Niobium or Columbium-Thorium-Thallium-Molybdenum-Rhodium-Iridium-Osmium-Silenium Tellurium-Zirconium. PART III. Assaying. Gold-Silver-Mercury-Copper-Lead-Bismuth-Tin-Iron-Nickel-Cobalt-Nickel and Cobalt-Coal PART IV. Tables. English Mint Value of Gold, According to its Fineness. Value of Gold Coins in the United States. American Mint Value of Gold, According to its Fineness. D. VAN NOSTRAND, Publisher, 23 Murray and 27 Warren Streets, New York. Copies sent by mail, post paid, on receipt of price. VALUABLE BOOKS ON Electricity and Electric Light. Sawyer's Electric lighting by Incandescence. 8vo.... Prescott's Electricity and the Electric Telegraph... (These two books of Prescott sold together for $7.00). 2.50 .$7.00 2.00 3.50 .40 5.00 4.00 The Telephone, the Microphone, and the Phonograph. By Count du Moncel... 1.25 · Hospitalier-Les Principales Applications de l'Electricite—with Many Illustrations, 8vo., paper. Paris, 1881.... 4.00 Schwendler's Instructions for Testing Telegraph Lines, 2 vols., 8vo.. 8.00 In Press, For Early Publication. "Induction Coils: How Made and How Used." For Sale by D. VAN NOSTRAND, Publisher, 23 Murray and 27 Warren Streets, New York. Copies sent by mail, post paid, on receipt of price. 18mo, Fancy Boards, 50 Cents Each. The subjects of this Series are of an eminently scientific character, and will ontinue to embrace as wide a range of topics as possible. 1. Chimneys for Furnaces, Fire Places and Steam Boilers. By. R. Armstrong, C. E. 2. Steam Boiler Explosions. By Zerah Colburn. 5. 6. Practical Designing of Retaining Walls. By Arthur Jacob, C. E. Illustrated. Illustrated. By Arthur Jacob, C. E. Illus 7. Surcharged and Different Forms of Retaining Walls. By Jas. S. Tate, C. E. Illustrated. A Treatise on the Compound Engine. By John Turnbull. Illustrated. 8. 9. Fuel. By C. William Siemens. To which is appended the value of Artificial Fuels as compared with Coal, by John Wormold, C. E. 10. Compound Engines. From the French of A. Mallet. 11. Theory of Arches. By Prof. W. Allan. Illustrated. 12. 13. 14. 15. 16. Illustrated. A Practical Theory of Voussoir Arches. By Wm. Cain, C. E. Illustrated. A Practical Treatise on the Gases met with in Coal Mines. By the late J. J. Atkinson. Skew Arches. By Prof. E. Hyde, C. E. Illustrated. A Graphic Method of Solving Certain Algebraic Equations. By Prof. Geo. L. Vose. Illustrated. 18. Sewerage and Sewage Utilization. By Prof. W. H. Corfield. 19. Strength of Beams under Transverse Loads. By Prof. W. H. Allan. 20. Bridge and Tunnel Centers. By John B. McMaster, C. E. 21. Safety Valves. By Richard H. Buel, C. E. Illustrated. Illustrated. Illustrated. 22. High Masonry Dams. By John B. McMaster, C. E. Illustrated. 23. 24. 25. The Fatigue of Metals under repeated Strains, with various Tables of Results of Experiments. From the German of Prof. Ludwig Spangenburgh, with a Preface by S. H. Shreve, A. M. Illustrated. A Practical Treatise on the Teeth of Wheels, with the Theory and Use of Robinson's Odontograph. By S. W. Robinson, Professor of Mechanical Engineering, Illinois Industrial University. Illustrated. On the Theory and Calculation of Continuous Bridges. By Mansfield Merriman, Ph. D. Illustrated. 26. Practical Treatise on the Properties of Continuous Bridges. By Charles Bender, C. E. Illustrated. On Boiler Incrustation and Corrosion. By F. J. Rowan. Transmission of Power by Wire Ropes. By Albert W. Stahl, U. S. N. Illustrated. 30. Terrestrial Magnetism and the Magnetism of Iron Vessels. By Prof. Fairman Rogers. 31. 32. Cable Making of Suspension Bridges, as Exemplified in the East River Bridge. By Wilhelm 33. Mechanics of Ventilation. By Geo, W. Rafter, C. E. 34. Foundations. By Prof. Jules Gaudard, C. E. Translated from the French, by L. F. Vernon Harcourt, M. I. C. E. 35. The Aneroid Barometer: Its Construction and Use. Illustrated. 36. Matter and Motion. By J. Clerk Maxwell, M. A. Compiled by Geo. W. Plympton. 37. Geographical Surveying. Its Uses, Methods and Results. By Frank De Yeaux Carpenter, C.E. 38. Maximum Stresses in Framed Bridges. By Prof. Wm. Cain, A. M., C. E. Illustrated. 39. A Hand Book of the Electro-Magnetic Telegraph. By A. E. Loring. Illustrated. 40. Transmission of Power by Compressed Air. By Robert Zahner, M. E. Illustrated. Strength of Materials. By William Kent, C. E. Illustrated. 41. 42. Voussoir Arches Applied to Stone Bridges, Tunnels, Culverts, Groined Arches and Domes. 43. Wave and Vortex Motion. By Dr. Thomas Craig, of Johns Hopkins University. 44. 45. Thermodynamics. By Prof. H. T. Eddy, University of Cincinnati. 46. Ice-Making Machines. From the French of M. Le Doux. Illustrated. 47. Linkages; the Different Forms and Uses of Articulated Links. By J. D. C. De Roos. 48. Theory of Solid and Braced Arches. By Wm. Cain, C. E. 49. On the Motion of a Solid in a Fluid. By Thomas Craig, Ph.D. 50. Dwelling Houses: their Sanitary Construction and Arrangements. By Prof. W. H. Corfield. D. VAN NOSTRAND, Publisher, 23 Murray and 27 Warren Streets, New York. Sent free by mail on receipt of price. |