94 
THE YOUNG SCIENTIST. 
and which prevents the book from sliding off. 
Tlio adjustment for regulating- tlic heig-lit of the 
table is very complete and effective. The cen- 
tral post is formed of two parts, and is made of 
metal nickel-plated ; the upper half drops into 
the lower part, and which contains a strong- 
spiral spring, which forces the top to the re- 
quired height, where it is firmly held by a 
screw- clip. A little pressure on the top of the 
table will force the top down, when it may 
be securely fastened. When the talkie is 
not in use, it may be folded up, legs andalJ, 
and laid away in any place, with the face 
of the top against the wall. 
The dimensions of the top are 30x23 
inches, just the size required for a small 
drawing-table or for a game-table. Per- 
haps th(3 amateur or scientific student who 
is hemmed-in by narrow limits, and who 
has not time or inclination to make a table 
suitable for his purposes, might find this 
answer quite well. 
in which the table is connected to the saw, 
wdiich is accomplished by a ball and socket 
joint. The ball is hollow, and the saw passes 
clean through it, there being ample room left 
for the saw to work without interference. • The 
main object of the ball and socket joint is to en- 
able the sawyer to tilt the table to any desired 
position for sawing inlaid work or cutting ma- 
t(H-ial on a rake. The table is held in position 
to 
The Cha llenge Scroll-saw, manufactured by the 
Seneca Manufacturing Co , beneca Falls, N. Y., 
iias recently been improved to such an extent 
that it is now one of the best saws available for 
Fig. 1. 
executing the finer kinds of work. The engrav- 
iug, Fig. 1, shows the saw in working trim, with 
boring attachment, blower and all complete^ 
An excellent feature m this saw is the method 
Fig. 2. 
by means of a clamp, which is attached to the 
joint, and which may be tightened or loosened 
at will l)y simi)ly turning a nut which forms 
part of the clamp. 
As a rule, the most unsatisfactory part about 
a scroll-saw is the device for holding the saw in 
place. This difficulty has, in a measure, been 
removed in this machine, as it is provided with 
an excellent device for holding the saw in a firm 
grip. A slot is made in the spindle, terminating 
in a small hole drilled through ; a small holt 
passes through the spindle below the hole ; on 
the end of the bolt is attached a thumb-screw, 
wl)ich can be tightened or loosened at will. The 
spindles are made from the best of Hobson 
steel, and are spring-tempered, so that the saw 
cannot slip when properly held, or tear or dis- 
figure the spindle in any way. 
The slots in the spindles are directly in line 
with the line of centre of spindles, which in- 
sures the true working of the saw, Avhich is a 
\Qi'Y important mattr>r in scroll-sawing. 
The workmanship on these machines is of the 
best kind, every part of it seemingly as perfect 
as hands and tools can make, and any part 
can be duplicated by sending to the manufac- 
tory. The capacity of the saw is to cut Avood up 
to one inch thick, and it will take in from four- 
teen to fifteen inches between the saw and the 
frame ; it is not liable to get out of order with 
fair usage, and is suited admirably to the wants 
of am.ateurs, shell, bone, and ivory workers. 
Metal may also be cut on this machine, if the 
plates are not too thick. The saw complete, 
without lathe attachment, weighs sixty-five 
pounds. 
Fig. 2 sliows the lathe attachment for the 
Challenge saw\ It is made of iron and steel; 
length of bed, 18 inches; distance between 
