16.
REFERENCES
385
distilled water.
Deposit a thin layer of chromium, then a layer
of aluminum without admitting air.
(3) Metallize an electrometer ber. Quartz bers are pre—
pared by heating the tips of two quartz rods to white” heat in an
oxygen flame and drawing one of them across the other. The
ame blows the ne threads away.
To catch them, place a piece
of cardboard, stack full of pins, at an angle in front and a little
above.
To prepare an electrometer suspension, choose a ber of
appropriate length and fasten a small lug and a square hook of
fine tungsten wire to its ends by means of small drops of shellac
and lampblack. The lampblack serves to insure electrical contact
between the tungsten and platinum coating which is to be sput—
tered on.
lWount half a dozen bers parallel to each other between
the sides of a rectangle of stiff wire, holding them in place with
drops of shellac or glyptal. The rectangle should have legs to
support it in a horizontal position about one half an inch above
the table.
Place this in the sputtering apparatus about eight or
nine centimeters from the cathode and reduce the pressure until
the edge of the cathode dark space is about half way between the
cathode and the fibers.
Using a one—half kilowatt, tenthousand
volt transformer, a conducting coat of platinum should be secured
_
in about thirty minutes. For gold the time will be about half
that for platinum.
REFERENCES
1. C. R. Burch, Nature, 122, 729 (1928).
_
2. Sloan, Thornton and ]enkins, Rev. Sci. Inst., 6, 80 (1935).
3. K. C. D. Hickman, ]r. Frank. Inst., 221, 215 (1936).
A. E. Lockenvitz, Rev. Sci. Inst., 8, 322 (1937).
4. G. C. Dunlap and ]. G. Trump, Rev. Sci. Inst., 8, 37 (1937).
5. O. E. Buckley, Proc. Nat. Acad. Sci., 2, 683 (1916).
6. ]aycox and Weinhart, Rev. Sci. Inst., 2, 401 (1931).
See also, ]. B. H. Kuper, Rev. Sci. Inst., 8, 394 (1937).
7. ]. B. Hoag and N. M. Smith, Rev. Sc1. Inst., 7, 497 (1936).
8. R. M. Zabel, Rev. Sci. Inst., 4, 233 (1933).
9.. ]. Strong, Astro, ]r., 83, 401 (1936).
F. Pearson, unpublished.
H. W. Edwards, Rev. Sci. Inst., 8, 451 (1937)
10. A. L. Hughes, Rev. Sci. Inst., 8,
REFERENCES
385
distilled water.
Deposit a thin layer of chromium, then a layer
of aluminum without admitting air.
(3) Metallize an electrometer ber. Quartz bers are pre—
pared by heating the tips of two quartz rods to white” heat in an
oxygen flame and drawing one of them across the other. The
ame blows the ne threads away.
To catch them, place a piece
of cardboard, stack full of pins, at an angle in front and a little
above.
To prepare an electrometer suspension, choose a ber of
appropriate length and fasten a small lug and a square hook of
fine tungsten wire to its ends by means of small drops of shellac
and lampblack. The lampblack serves to insure electrical contact
between the tungsten and platinum coating which is to be sput—
tered on.
lWount half a dozen bers parallel to each other between
the sides of a rectangle of stiff wire, holding them in place with
drops of shellac or glyptal. The rectangle should have legs to
support it in a horizontal position about one half an inch above
the table.
Place this in the sputtering apparatus about eight or
nine centimeters from the cathode and reduce the pressure until
the edge of the cathode dark space is about half way between the
cathode and the fibers.
Using a one—half kilowatt, tenthousand
volt transformer, a conducting coat of platinum should be secured
_
in about thirty minutes. For gold the time will be about half
that for platinum.
REFERENCES
1. C. R. Burch, Nature, 122, 729 (1928).
_
2. Sloan, Thornton and ]enkins, Rev. Sci. Inst., 6, 80 (1935).
3. K. C. D. Hickman, ]r. Frank. Inst., 221, 215 (1936).
A. E. Lockenvitz, Rev. Sci. Inst., 8, 322 (1937).
4. G. C. Dunlap and ]. G. Trump, Rev. Sci. Inst., 8, 37 (1937).
5. O. E. Buckley, Proc. Nat. Acad. Sci., 2, 683 (1916).
6. ]aycox and Weinhart, Rev. Sci. Inst., 2, 401 (1931).
See also, ]. B. H. Kuper, Rev. Sci. Inst., 8, 394 (1937).
7. ]. B. Hoag and N. M. Smith, Rev. Sc1. Inst., 7, 497 (1936).
8. R. M. Zabel, Rev. Sci. Inst., 4, 233 (1933).
9.. ]. Strong, Astro, ]r., 83, 401 (1936).
F. Pearson, unpublished.
H. W. Edwards, Rev. Sci. Inst., 8, 451 (1937)
10. A. L. Hughes, Rev. Sci. Inst., 8,