It may be of interest to those owning telescopes without solar eyepieces to know that such an eyepiece can be obtained very cheaply by purchasing a pair of colored eyeglasses with very dark lenses and metal rims.  Break off the frame, leaving the metal rims and nibs at each end.  Place these over the eyepiece of the telescope and secure in place with rubber bands looped over the nibs and around the barrel of the instrument. 
   —­Contributed by R. A. Paine, Richmond, Va.

** How to Make an Electrical Horn [218]

Secure an empty syrup or fruit can, any kind having a smooth flat bottom will do.  If the bottom is not perfectly flat, it will interfere with the regular tone vibrations, and not produce the right sound.  Remove the label by soaking it in hot water.  Take an ordinary electrical bell and remove the gong, clip off the striking ball and bend the rod at right angles.  Cut a block of wood 3/4 in. thick, 5 in. wide and 8 in. long for the base.  Fasten the can on it with a piece of sheet brass or

[Illustration:  Tin Can and Bell Parts]

tin as shown in the sketch.  Mount the bell vibrator on the base, using a small block of wood to elevate it to the level of the center of the can, and solder the end of the vibrator rod to the metal.

Connect two dry cells to the bell vibrator, and adjust the contact screw until a clear tone is obtained.  The rapidly moving armature of the bell vibrator causes the bottom of the can to vibrate with it, thus producing sound waves.  The pitch of the tone depends on the thickness of the bottom of the can.  This horn, if carefully adjusted and using two cells of dry battery, will give a soft pleasant tone that can be heard a block away.  If the two projecting parts of the vibrator are sawed off with a hacksaw, it can be mounted on the inside of the can.  This will make a very compact electric horn, as only the can is visible. —­Contributed by John Sidelmier, La Salle, Ill.

** Driving a Washing Machine with Motorcycle Power [219]

The halftone illustration shows how 1 rigged up my washing machine to be driven by the power from my motorcycle.  I made a wheel 26 in. in diameter of some 1-in. pine boards, shrunk an iron band on it for a tire, and bolted it to the wheel on the washing machine.  A long belt the same width as the motorcycle belt was used to drive the machine.  The motorcycle was lined up and the engine started, then the motorcycle belt thrown off and the long belt run on, connecting the engine and washing machine wheel. -1.  R. Kidder, Lake Preston, S. D.

[Illustration:  Machine Belted to the Motorcycle]

** Home-Made Aquarium [219]

A good aquarium can be made from a large-sized street lamp globe and a yellow pine block.  Usually a lamp globe costs less than an aquarium globe of the same dimensions.  Procure a yellow pine block 3 in. thick and 12 in. square.  The more uneven and twisted the grain the better for the purpose,