Popular Science Monthly 



923 



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 



