cut in the paper and the lantern placed on a table in front of the hole, the lamp having been removed and the back opened.  The lantern must be arranged so that the lens will be on a horizontal line with the hole in the paper.  A mirror is then placed just outside of the window and at such an angle that the beam of light is thrown through the hole in the paper and the lens of the lantern.

The shades of the remaining windows are then drawn and the lantern is operated in the usual way.  —­Contributed by L. B. Evans, Lebanon, Ky.

** A Handy Drill Gauge [252]

The accompanying sketch shows a simple drill gauge which will be found very handy for amateurs.  The gauge consists of a piece of hard wood, 3/4 in. thick, with a width and length that will be suitable for the size and number of drills you have on hand.  Drill a hole through the wood with each drill you have and place a screw eye in one end to be used as a hanger.  When you want to drill a hole for a pipe, bolt,

[Illustration:  Drill Gauge]

screw, etc., you take the gauge and find what size drill must be used in drilling the hole.-Contributed by Andrew G. Thome, Louisville, Ky.

** Stove Polish [252]

A good stove polish can be made by mixing together 1 lb. of plumbago, 4 oz. of turpentine, 4 oz. of water and 1 oz. of sugar.  Mix well and apply with a cloth or brush.

A Home-Made Daniell Cell [252]

An effective Daniell galvanic cell may be constructed from material costing very little money.  A common tin tomato can with a copper wire soldered to the top forms the jar and positive electrode.  A piece of discarded stove zinc rolled into an open cylinder of about 1-1/2-in. diameter, 5 in. long, with a copper wire soldered at one end forms the negative electrode.

To make the porous cell, roll a piece of heavy brown wrapping paper, or blotting paper, into a tube of several thicknesses, about 5 in. long with an internal diameter of 2 in.  Tie the paper firmly to prevent unrolling and close up one end with plaster of paris 1/2 in. thick.  It is well to slightly choke the tube to better retain the plaster.  The paper used must be unsized so that the solution scan mingle through the pores.

Two liquids are necessary for the cell.  Make a strong solution in a glass or wooden vessel of blue vitriol in water.  Dilute some oil of vitriol (sulphuric acid) with about 12 times its measure of water and keep in a bottle when not in use.  In making up the solution, add the acid to the water with constant stirring.  Do not add water to the acid.

The cell is charged by placing the zinc in the paper tube and both placed into the tin can.  Connect the two wires and pour the dilute acid into the porous cell around the zinc, and then immediately turn the blue vitriol solution into the can outside the paper cup.

A current generates at once and metallic copper begins to deposit on the inside of the can.  It is best to let the action continue for a half hour or so before putting the cell into use.