Cheap Telephones

I noticeu a recipe for making a cheap telephone, given by Prof. Barrett in a recent lecture on that instrument. In making liis instrument you use a bar magnet, and have to go to considerable trouble, for all of which you can only talk a distance of about 100 yards. Now, I can give you a recipe rauch more simple, and, wken the instrument is flnished, you can converse at a distance of nearly 500 yards. Take two half-gallon (or quart) tin fruit cans and take the bottoms out of them. Now take a couple of half cignr-boxes, tack down the lids, and ent a hole throngh the bottom and lid of cach, so yon can fit in your cans, first bringing the ends level with the lid orbottom. Now stretch wet rawhide, parclimont or bladder over the other end, and tio tight and Iet it dry, and your speaking tubes are flnished. Now, take two-ply of shoethread and wax it well, making it as long as you wish it. Punch a hole in the center of the parchment head, poke the end of the string through, and put a knot on it to keep it from puiling back. Then put up your string like a telegraph wire, but don't let it touch wood. Where you wish to support it or make turn, run it through a loop of the same kind of string it is, but don't put the supportiug loop closer togethor than is necessary to keep it up, ind leave tho string pretty loose to alow for contraction when wet. Fasten np your speaking tnbes at each end of ;he rout and yon are roady to gabble awny. You can bore largo gimlet holes n your window sash to run the lino out ;hrough, keeping it from touching the sas'u with a loop as desoribed. Tho signal-call is to drum on tho parchmcut end of tlio can with your fingers, or, bottei, piek the strick fiko a harp a-bout a foot from the head. ïhey aro very