51. Dry Cell.--52. Mercury.--53. Insulated Copper Wire; for connections.--54. Spring Connectors; two dozen.--55. Parts for Key.--56. Metal Connecting Plates.--57. Parts for Current Reverser.--58. Parts for Galvanoscope.--59. Parts for Astatic Galvanoscope.--60-63. Zinc Strips.--64. Carbon Rod.--65, 66. Glass Tumblers.--67, 68. Copper Strips.--69. Galvanized Iron Nail.--70, 71. Wooden Cross-Pieces.--72. Brass Screws; one dozen.--73. Porous Cup.--74. Zinc Rod.--75. Copper Plate.--76. Iron Strip.--77, 78. Lead Strips.--79. Parts for Resistance Coil.--80. Parts for Wheatstone's Bridge.--81. German-Silver Wire; Size No. 30.--82. German-Silver Wire; No. 28.--83--85. Plate Binding-Posts.--86. Copper Sulphate.--87. Copper Burs; one dozen.--88. Combination Rule.--89. Coil of Wire; on spool for electromagnet.--90. Coil of Wire; on spool for electromagnet.--91. Carbon Rod.--92, 93. Soft Iron Cores with Screws.--94. Combined Base and Yoke.--95. Combination Connecting Plates.--96. Long Iron Core.--97. Round Bar Magnet, 5 × 3/8 in.--98. Thin Electromagnet.--99. Degree-Card; for galvanoscope.--100. Scale for Bridge.--101, 102. Soft Iron Cores with Heads.--103, 104. Flat Bar Magnets; these are 6 × ½ × ¼ in.; highly polished steel; poles marked.--105. Compass. =_Illustrated Price Catalogue upon Application._= Electrical Apparatus For Sale A COMPLETE ELECTRIC AND MAGNETIC CABINET FOR STUDENTS, SCHOOLS AND AMATEURS. SIX EXTRAORDINARY OFFERS =This Cabinet of Electrical Experiments= contains three main parts: (_A_) Apparatus; (_B_) Text-Book; (_C_) Apparatus List. (_A_) =The Apparatus= furnished consists of one hundred and five pieces. Over three hundred separate articles are used in making up this set. Most of it is ready for use when received. Seven pieces, however, are not assembled; but the parts can be readily finished and put together. (Sold, also, _all_ pieces assembled.) (_B_) =The Text-Book=--called "The Study of Elementary Electricity and Magnetism by Experiment"--gives full directions for two hundred experiments. (See table of contents, etc.) Price, post-paid, $1.25. (_C_) =The Apparatus List= is an illustrated book devoted entirely to this special set of apparatus. Not given with first offer. _THE APPARATUS IS SIMPLE because the designs and methods of construction have been worked out with great care._ _THE APPARATUS IS PRACTICAL because it has been designed for real use in "The Study of Elementary Electricity and Magnetism by Experiment."_ _THE APPARATUS IS CHEAP because the various parts are so designed that they can be turned out in quantity by machinery._