THE YOUNG SCIENTIST. 
43 
■eus powder well rubbed in before a fire. 
When properly made, this strop will be 
found to give a keen edge to the tools, 
and by a little ingenuity in the make-up, 
may be made so as to answer in sharpen- 
ing the inside, as well as the outside, of 
tools. ♦ 
Fig. 6 shows two tools properly sharp- 
ened. It will be noticed that the basils or 
bevels of the tools are long and evenly 
made. 
A good way of testing the keenness of 
^edge on a tool is to try it on a piece of 
soft pine, cutting across the grain, when, 
if the tool is properly sharpened, a clean 
cut, without any tearing of the grain, will 
be the result. 
In future issues of the Young Scientist 
'examples for carving, with full instruc- 
tions as to operation and materials, will 
be given. 
Scroll-Saw Novelty. 
O doubt many of our readers who 
own scroll- saws will be glad to 
get a design for making a hand- 
some, and at the same time 
efficient, summer fire-screen, like the one 
we illustrate and describe below. Fig. 1 
shows the screen completed on a reduced 
Fig. 1. 
scale. The actual height of screen from 
floor will be about twenty and a lialf 
inches to top of central leaf. Eleven of 
the leaves (Fig. 2), two uprights (Fig. 3j, 
and two cross-pieces (Fig. 4), complete 
the design. To work the leaves a fine 
close-grain but light wood should be 
chosen, not more than § incli in thick- 
ness ; to avoid monotony and trouble, at 
least four leaves may be worked at a time 
