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Drilling.–Use kerosene to drill, ream or turn malleable iron, or to drill or turn aluminum. Turpentine should be used instead of oil for drilling hard steel, as it will cause drilling readily when the metal cannot be touched with oil. By using a combination of turpentine and camphor, glass may be drilled with a common drill. When the point of the drill comes through the hole should be worked with the end of a three-cornered file, having edges ground sharp. Use the corners of the file to scrape rather than as a reamer. Great care must be taken not to crack the glass or flake off pieces of it while finishing. The mixture should be used freely, both while drilling and scraping. It may be used as well to drill hard cast iron and tempered steel.

Body Polish.-A much recommended body polish is made by mixing the following ingredients:

Turpentine
Paraffine Oil ..
Oil of Citronella
Oil of Cedar

1 gallon ....1 pint 31/2 ounces 11/2 ounces

Another scheme is to use a mixture of boiled linseed oil and turpentine, applying it sparingly and rubbing absolutely dry. The use of these polishes will restore even an old car to a degree of brightness that will please the owner. Floor wax is also used, as is furniture polish.

Care of Tops.-Mohair tops should be frequently dusted and brushed off. Pantasote tops and curtains are best cleaned with a soft brush dipped in water to which a little ammonia has been added. Afterwards rub dry. Never attempt to clean top and curtains with gasoline or kerosene. Do not fold the top until it has become thoroughly dry, because any moisture remaining in the folds is apt to cause mildew, besides making the top leaky and unsightly with spots. When a car is not used for some time, it is best to open the top, which keeps it well stretched and smooth.

Care of Leather Upholstery.-Do not use gasoline in cleaning leather upholstery. Plain water with a little ammonia will remove the dirt and a brisk rubbing with a clean woolen or flannel cloth will do the rest. For still more careful treatment use a regular leather dressing.

Care of Cloth Upholstery.-Do not use an acid solution in cleaning cloth upholstery.

Cloth is not affected by climatic conditions and withstands both heat and cold, and having no oil in its make-up, does not pick up or hold dust readily. To remove ordinary dust, beat cushions and backs lightly with stick or carpet beater, then remove dust with whisk-broom or brush. Grease or oil may be removed by the application of a solution of luke warm water and Ivory soap applied with a woolen cloth. Any of the approved methods for cleaning woolen cloth may be used with success on this upholstery. Gasoline and benzine have a tendency to spread instead of removing the dirt. Their use is not recommended for this reason, although they work no injury to the fabric.

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Mathematical Tables Table of Inch Decimal Equivalents—Millimeter Decimal Equivalents

Metric Conversion Tables—General Formulæ in Mensuration-Diagonals of Hexagons and Squares—U. S. Measures and Weights—Trigonometri. cal Formulæ-Circumferences and Areas of Circles.

Mechanical Tables
S. A. E. Screw Standard-Standard Hexagon Bolts and Nuts-Machine

Screw Table—Dimensions-Pipe Threads—S. A. E. Carburetor Fittings
-Standards for Vire Gauges—Calculating Length of Chain—Table
Allowances for Grinding—Sizes of Drills to Use for Hand Taps—Twist
Drill Gauge Sizes Speed of Drills—Figuring Emery Wheel Speeds—
Pulley Sizes—Lathe Gearing for Cutting Threads—Allowances for Fits.

Miscellaneous Tables
Time Per Mile Expressed in Miles Per Hour—Comparative Scale, Fahrenheit

and Centigrade Thermometers—Horsepower Chart—Compression Pressure-Approximate Horsepower of Four-Cycle Engines—Two-Cycle Engines—Indicated Horsepower-Weights of Metals—Weight of Steel Bars—Weight of Castings to That of Wood Patterns—Table of Gradients—Calculating Grade Percentages—Chart for Determining Speed of Car,

THOSE engaged in mechanical work cannot fail to appreciate the tables which follow, selected with care and with special reference to automobile repairing, machine work and allied industries. These have been compiled from standard authorities on mechanics, standards, metallurgy, automobile construction and design, mathematics, et cetera, and therefore can be divided into three general classes. Those dealing with arithmetic are in one group, those having to do with machine work are in another group, while the remainder deal with miscellaneous subjects. It is believed that the tabulation can be of value in many ways to the motorist as well as to the mechanic. While this data is available to all who can consult different standard works, it is believed that compilation in condensed form, as well as a rearrangement in some cases to simplify the matter, will make it

of real service to the laymen as well as the more expert machini: and repairman. Because of the number of authorities consulted ar the many works from which the tables have been made, it is nu possible to give individual acknowledgment, especially as many of the tabulations have long been public property and have been geuerally used by writers on mechanical subjects.

Table of Decimal Equivalents

8ths

Y = .125 14 = .250 38=.375 *2.500 5= .625 34= .750 78=.875

32 = .21875 ja = .28125 11 = .34375 $1 = .40625

.46875 12 =.53125 }} = .59375 31= .65625

} = .71875 ji = .78125 31 = .84375 39 = .90625

= .96875

16ths

di = 296875

= .328125

= .359375 at= .390625 31 = .421875 ii=.453125 it= .484375

=.515625

= 546875 41= 578125

= .609375

= .640625 H=.671875 11= .703125 11 = .734375 11= .765625 #1= .796875 t=.828125

= .859375 21 = .890625

= .921875

= .953125 f=.984375

= .0625 Id= .1875 Po= .3125 To= .4375 1 = .5625 13 = .6875 18 = .8125 it = .9375

64ths

it= .015625

= .046875 o't= .078125 77= .109375 o't= .140625 ut= .171875

= .203125 If = .234375 *1= .265625

32ds

32 = .03125
gis = .09375
I'm = .15625

Table of Decimal Equivalents of Millimeters and

Fractions of Millimeters

Mm.

Inches

Mm.

Inches

Mm. Inches

2= 07874

3= = .11811

4= .15748

5= .19685

6= 23622

7= .27559

8= .31496

9= .35433

10=

= .39370

11= .43307

12 = .47244

13= .51181

3 = .00079

= .00157 %= .00236 to = .00315 o= .00394 50 = .00472 3= .00551 5o= .00630 36 = .00709 *8 = .00787 }}= .00866 }} = .00945 18 = .01024 }}= .01102 38= .01181 38 = .01260 33 = .01339 38 = 01417 38 = .01496 *8 = .01575

= .01654 y = .01732 30 = .01811 $= .01890 $f= .01969

= .02047 47= .02126 38 = .02205 i = .02283 $8= .02362 33 = .02441 3= .02520 }&= .02598

= .02677 33 = .02756

= .02835 $7 = .02913 8= .02992

= .03071 38 = .03150 $t = .03228 *%= .03307 ${= .03386 $= .03465

= .03543 $8= .03622 37 = .03701 $8= .03780 M&= .03858

[blocks in formation]

1= .03937

26=1.02362

10 mm. = 1 Centimeter 0.3937 inches.
10 cm.

1 Decimer 3.937 inches.'
10 dm. 1 Meter

39.37 inches. 25.4 mm. 1 English inch,

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