or inside of roll with benzine, using a small brush or swab. 9.  Put the thimble or pointer on the end of shaft that the washer has been removed from, and give shaft over the twine and thimble another coat of cement, and stand same upright in a vise. 10.  Give the inside or hole of roll a coat of cement with a small rod or stick. 11.  Pull or force the roll on the shaft as quickly as possible with a jerk, then rivet the washer on with a cold chisel. 12.  Let roll stand and get dry for two or three days before using same.  Cement for use should be so thick that it will run freely; if it gets too thick, thin it with benzine or naphtha.

How to Make Effervescing Solution of Citrate of Magnesia.—­Dissolve citric acid 400 grains in water 2,000 grains, add carbonate of magnesia 200 grains; stir until dissolved.  Filter into a 12-ounce bottle containing syrup of citric acid 1,200 grains.  Add boiled and filtered water to fill bottle, drop in bicarbonate of potash in crystals 30 grains and immediately cork.  Shake until bicarbonate of potash is dissolved.  The syrup of citric acid is made from citric acid 8 parts, water 8 parts, spirit of lemon 4 parts, syrup 980 parts.

A Receipt for Making the Black Cement that is Used for Filling Letters after They are Cut out in Brass.—­Mix asphaltum, brown japan and lampblack into a putty-like mass, fill in the spaces, and finally clean the edges with turpentine.

Useful Workshop Hints.—­Clean and oil leather belts without taking them off their pulleys.  If taken off they will shrink.  Then a piece must be put into them and removed again after the belt has run a few days.  The decay of stone, either in buildings or monuments, may be arrested by heating and treating with paraffin mixed with a little creosote.  A common “paint burner” may be used to heat the stone.  Set an engine upon three or four movable points, as upon three cannon balls.  Connect with steam, and exhaust by means of rubber hose.  If the engine will run up to speed without moving itself back and forth, then that engine will run a long time with little repair.  If it shakes itself around the room, then buy another engine.  Safely moving a tall mill chimney has been accomplished several times.  Chimneys which have been caused to lean slightly through settling of the foundation may be straightened up again by sawing out the mortar between courses of brick at the base.  A chimney 100 ft. high and 12 ft. square at the base will be varied over 8 in. at the top by the removal of 1 in. at the base.  When you begin to fix up the mill for cold weather, don’t forget to put a steam trap in each and every steam pipe which can be opened into the atmosphere for heating purposes.  For leading steam joints, mix the red lead or litharge with common commercial glycerine, instead of linseed oil.  Put a little carbolic acid in your glue or paste pot.  It will keep the contents sweet for a long time.  Look well to the bearings of your shafting engine