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SHOP NOTES. 477
also very well adapted to the metric system, as 0.6 inch per
foot is equal to 0.05 millimeter per millimeter.
The following table is given to illustrate the system. The
table could be extended to as large size tapers as are required
for any work.
TABLE No. °1,_Jarno Taper.
Number of
Taper.
Length of
Taper.
Diameter of
Large End of
Taper.
Diameter of
Small End of
Taper.
1
2 1
y
8 = 0.125
yi
= 0.250 * - 0.2
3
4 2
3/
8 = 0.375
y
2 = 0.500
T
3
* = 0-3
T
4
o
= 0-4
5
6
2*A
3
5/
8 = 0.625
f4 = 0.750
% = 0.5
t =0.6
7
8
3^
4
7/
8 = 0.875
1 = 1.000
t
7
o
= 0.7
1 =0.8
9
10 5
iy
8 = i.i25
1% = 1.250
A = 0.9
1 = 1.0
This system of taper is described by " Jarno " in the Amer-
ican Machinist, October 31, 1889.
Marking Solution.
Dissolve one ounce of sulphate of copper (blue vitriol) in
four ounces of water and half a teaspoonful of nitric acid.
When this solution is applied on bright steel or iron, the surface
immediately turns copper color, and marks made by a sharp
scratch-awl will be seen very distinctly.
A Cheap Lubricant for Milling and Drilling.
Dissolve separately in water 10 pounds of whale-oil soap and
15 pounds of sal-soda. Mix this in 40 gallons of clean water.
Add two gallons of best lard oil, stir thoroughly, and the solu-
tion is ready for use.
Soda Water for Drilling.
Dissolve three-fourths to one pound of sal-soda in one pail
full of water.
Solder.
Ordinary solder is an alloy consisting of two parts of tin
and one part of lead, and melts at 360°.
Solder consisting of two parts of lead and one part of tin
melts at 475°. For tin work use resin for a flux.
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