| Pads of 40 sheets, 6x9 inches. | Price | 25 cents |
| Pads of 40 sheets, 9x12 inches. | Price | 50 cents |
| 40 sheets, 12x18 inches. | Price | $1.00 |
ELECTRICITY
Arithmetic of Electricity. By Prof. T. O’Conor Sloane.
A practical treatise on electrical calculations of all kinds reduced to a series of rules, all of the simplest forms, and involving only ordinary arithmetic; each rule illustrated by one or more practical problems, with detailed solution of each one. This book is classed among the most useful works published on the science of electricity, covering as it does the mathematics of electricity in a manner that will attract the attention of those who are not familiar with algebraical formulas. 20th Edition. 160 pages. Price $1.00
Commutator Construction. By Wm. Baxter, Jr.
The business end of any dynamo or motor of the direct current type is the commutator. This book goes into the designing, building, and maintenance of commutators, shows how to locate troubles and how to remedy them; everyone who fusses with dynamos needs this. 4th Edition. Price 25 cents
Dynamo Building for Amateurs, or How to Construct a Fifty-Watt Dynamo. By Arthur J. Weed, Member of N. Y. Electrical Society.
A practical treatise showing in detail the construction of a small dynamo or motor, the entire machine work of which can be done on a small foot lathe. Dimensioned working drawings are given for each piece of machine work, and each operation is clearly described. This machine, when used as a dynamo, has an output of fifty watts; when used as a motor it will drive a small drill press or lathe. It can be used to drive a sewing machine on any and all ordinary work. The book is illustrated with more than sixty original engravings, showing the actual construction of the different parts. Among the contents are chapters on: 1. Fifty-Watt Dynamo. 2. Side Bearing Rods. 3. Field Punching. 4. Bearings. 5. Commutator. 6. Pulley. 7. Brush Holders. 8. Connection Board. 9. Armature Shaft. 10. Armature. 11. Armature Winding. 12. Field Winding. 13. Connecting and starting.
| Paper. | Price | 50 Cents |
| Cloth. | Price | $1.00 |
Electric Bells. By M. B. Sleeper.