Popular Science Monthly
��Drill Holder for the Tailstock of a Lathe
THE drill holder illustrated was designed to comply with a law enforced in many states which demands that a drill must be
���A drill chuck for the lathe center that pro- vides a holding device without projections
firmly held in a chuck or other suitable device without projections when used on work held in the chuck or fastened to a faceplate of a lathe. An efficient chuck is shown above, in use in a lathe.
The holder is made of machine steel, the shank A being turned on a taper to fit in the tailstock. The socket B is bored to fit the Morse taper. This taper in No. 2 will take all drills up to and including 29/32 in., and is best suited for small lathes. A No. 3 taper is better for lathes of 14-in. swing or larger. — Harvey Mead.
��Details and dimensions for the lathe drill holder
��Some Useful Hints for the Owner of a Phonograph
IF the spring rubs or jumps when the phonograph is playing it is a sign there is a dry spot somewhere between the leaves. Wind it up fairly tight and let it run com- pletely down two or three times. This will open up the leaves and distribute the grease between them.
Phonographs equipped with metal horns can be much improved in tone and the metallic effect killed by wrapping the horn with electricians' or tire tape.
Camels' hair brushes are of little use in cleaning disk records. Glue a piece of
��clean Brussel's carpet to a block of wood and rub the record well with a circular motion. This removes grit and dirt that the brush might pass over and does not injure the record in the least.
The troublesome vibration occurring in many machines can be remedied by insert- ing felt between a.l joints in the cabinet and where the motor touches the wood.
Loud needles can be made to play as soft as desired if they are inserted only part way in the holder.
��Coating for Window Glass to Keep Off the Frost
FIRST clean the panes thoroughly and wipe them dry. Dissolve 1 oz. of glycerine in a pint of alcohol, (denatured alcohol will answer the purpose) and add a little amber oil to improve the odor. Let the solution stand until it clears, then rub it over the inside of the window panes with chamois or a hard cloth. This treatment of the windows in cold weather is in- expensive and often reduces complaints about insufficient heating made by store- keepers whose grievance is founded only on the obscuring of their show win- dows. — Peter J. M. Clute.
��Instruction-Marker Plate for Photo- graphic Plate Holders
A GREAT many amateur photographers who have their exposures finished at a studio frequently have their instructions misunderstood as to how many prints are wanted and when. The illustration shows how a thin strip of celluloid on which any information can be written can be glued to the side of the holder. On the majority of cameras using or accommodating plates, this does not interfere with the entrance of the holder into the slide at the rear. The upper side of the strip can be slightly pointed as shown, toward the side of the holder to which the informa- tion refers. The other strip would of course be inverted. Use a good grade of glue so that the small thin strips will ad- here permanently. Any kind of light celluloid has sufficient grit for a lead pencil to make a perfectly legible mark on it.
���Instruction - marker plate for plateholder