The Washington times. [volume] (Washington [D.C.]) 1902-1939, 1903-01-25
HOW TO MAKE 4 CHRONATIC TOP.

Tha chTomatic to1 was so named be-
cause it, can be used to demonstrate how
changes of hue ard tone are dependent
upon The proportions Of the primary col
Crs contained IN the solar spectrum. ."
Any boy blessed with a clever pair of
hands and an Ingenious turn OF mind can
become the pOssessor of one of these
little wonders b. carefully following the
. directions here given.
The first thing that you will require
viii be- piece OF WOOD about five and
q half inches square by one inch thick
Any hard wood viii do. but try TO OBJ
. tain piece Of beech or tine-g grained ma
. hoEany. The wood must be placed on q
/ lathe and turned down TO a circular disk
/ Of five inches diameter. ANY CARPENTER
VIII DO this as well as the other work
that VIII have to be done on a lathe
for rTlfiuE compensation.
Then turn a recess throe-eighths of an
inch deep, commencing ouc-quarter OF
an inch from the outside edge and Ieav-
ing central portion projecting of half
an inch diameter. as a a Zig. -, which
is q cross section Of the body Of the
top the dotted lines representing a cross
section of the disk before the turning
is done
The rim Of the top De and ED Gig.
j can now be turned down ODe-efghth
OF al iAtil- tllttN VIII led-e 1t only one
quarter of an inch high and it should
then be curved of nicely, as shown at
B Fig d.
This side Of the body Of the top can
now he finished of with sandpaper. as
nothing remains to be done TO it. The
underneath portion. however. must now
be put on the lathe and be turned 90
graceful curve as at BIC Gig. u. leav-
ing G Fig. u Onc-quaTteT Of an inch
rs fin -h DFr
this side, too. with sandpapeT. small
hole. about Onc-sIEteenth Of an inch in
diameter should be drilled through the
center. s 10 G, as shown by the dotted
line in Fig. j.
Now geL d small piece OF sheet lead.
one-eighth of an inch thick. and have
il turned into q disk of four and half
inches diameter, with a central hole Of
hair an inch diameter. The purpose Of
his circular disk is TO give weight to
the top and thus make it spin steadily
which is thing very much to be de-
sired This disk is to be placed on the
upper side Of the body Of the top. and
if il has been turned neatly YOU will
find that If viii exactly fit the recess
which you had turned in the top Be
fore placing IL in position. however. You
should glue both the upper part Of the
top and the ieaden disk itself so hat
it viii hold fast when once IT has been
put in place.
The body of the top is now complete.
and all YOU require is a small wooden
spindle and Two carpenters screws. One
of the screws should be about four
inches long and the other two and @ half
inches.
The smooth portion OF the longer screw
should be about two inches long as IN
FiV p Measure half an inch OF The
screw from where the plain part left or.
and then cut of the remainder Of the
screw, so that your whole screw viii now
be about two and q half inches long
Now lay the screw aside, while Tou
turn small wooden spindle Jas in Fig
81 OF about half IN inch diameter. finish
1T with saudpaper. and dril hole
through 1t. Ieugrhwise. OF sufficient size
70 allow The plain portion OF the screw
to Tavoive easily The spindle should
be about to inches long. and one Of
Dr. must be couutersuDk. as shown in
the dotted lines rig -, so that the head
Of the screw may lie fiat In it.
4 little powdered bIacklead should be
sprinlIad in the hole Of the spindle to
lubTic1te it Place the screw through
il and then screw through the body of
The top at A Gig. u. the small hole
which you drilled a. that point enabling