Contributed by D. Foster Hall.
Mahogany Wood Putty
Mix venetian red with quite thick arabic muscilage, making it into a putty, and press this well into the cracks of mahogany before finishing. The putty should be colored to suit the finish of the wood, says the Master Painter, by adding such dry color to the gum as will give the best result.
How to Make a Thermoelectric Battery
By Arthur E. Joerin
Details of Battery
A novel way of producing an electric current by means of hot and cold water, heat from a match or alcohol lamp, is obtained from a device constructed as shown in the sketch. Take two hardwood boards, marble, or slate plates, about 8 or 10 in. long, place them together, as in Fig. 1, and mark and drill about 500 holes. These two pieces should be separated about 8 in. and fastened with boards across the ends, as shown in Fig. 2.