March, 1922 
nt the other (see sketch). This is used 
for the lock. The eye should be just 
gmall enough to pass through the hole 
111 the framei and the shank long enough 
§0 that when the hasp is in position and 
the bolt head against it, the eye will pro- 
ject out oii the inside of the frame. 
This measurement, of course, depends 
upon the thickness of the' doOr frame. 
Now g€t three large Screw eyeS and 
screw them on tlie inside of the door 
frame, two of them straddling the hole 
above and below, and the third about six 
inches above the bole, These' must be in 
line and are guides for tbe steel fod 
which is Used to lock the bolt in position. 
Make an eye in the top end of this 
rod through which is fastened a strong- 
cord or, better Still, a length of small 
flexible wire rope. The rod Should be 
long enough to go through the two lower 
screw-eyes and the bolt-eye when the 
eye rests on the upper screw-eye. Two 
wooden strips act as guides for the bolt- 
eye and are fastened to each side of 
the hole as shown. 
Lead the cord through a small pulley 
above the rod and then down hy a sec- 
ond one through the floor close to the 
sill and allow it to hang — with a small 
weight on it — under the house and be- 
hind the lattice w'ork or other hiding 
place. The weight on the cord should 
be enough to raise the rod out of the 
eyes and release the bolt. 
To lock — set hasp in position — push 
the bolt through and drop the rod in 
place. To unlock-“pull on the cord 
A ^jfAM^£Af£/^r aurs/pe of 
which raises the rod and releases the 
bolt which can then he pulled out. 
L. B. Robbins, 
Mass. 
HOW TO START A FIRE 
WITH ICE 
T he inventor of the Both Eyes Open 
gun sight, of Lewisport, Kentucky, 
is passing this along to the readers of 
Forest and Stream, with the view of 
furthering information for fire-starting 
to off-stand starvation or freezing to 
death when lost or delayed in a wilder- 
ness without matches or the means for 
starting a fire; 
“One day in mid-winter, while out for 
ducks on the Indiana side of the Ohio 
at this point, I was forced by the river's 
wildness to remain on Corn Island, 
Avhich was but a small piece of land at 
this time, owing to the high water. The 
white-caps were rolling too high and 
threatening to attempt a crossing in my 
small boat, and there was no escape save 
through several miles of over-flowed 
bottom land back to the hills, so 1 de- 
cided to remain on the island until the 
wind and waves subsided. 
Fire wood was plentiful but I bad no 
matches, and had never been successful 
in starting a fire with smokeless powder 
— not since the days of “black” had I 
been able to make a fire with the shot- 
gun. Mr. Recktenwalt’s letter, just 
read, in your January issue, telling how 
one may do it, is new and interesting to 
me. Of course, smokeless powder un- 
confined would burn slowly enough to 
start a fire but the idea had never oc- 
curred to me. i searched my pockets 
many times for a match in vain. I tried 
several shells into perfectly dry bunches 
of grass and then remembered that it 
had occurred to me some time before 
that it would be possible to make a lens 
of ice the same as a reading glass and 
start a fi e with the assistance of the 
rays of the SUn. 
Fortunately, I found a clear ])ieer of 
ice about three - eighths of an inch in 
thickness. With my pocket knife I cut 
a disk about three inches in diametei' 
then trimmed it as nearly as I cf)uld 
to represent a double-convex lens, or 
reading glass, lea\ ing its thickness about 
three-eighths of an inch in the center 
and tapering both sides t(j a straight 
thin edge. At first it did not concen- 
trate the rays to a good focal point. I 
thought its surface perhaps was too 
rough. Taking it between the palms of 
my hands I made circular movemeuLs 
back and fortb, and this beating of its 
surface quickly formed it into a lens 
good enougb for .starting a fire, which 
it did .so quickly I was a.stonishcd. 
F. E. riRECORV, 
New York. 
A RAZOR-BLADE KNIFE 
A NIFTY little tool for holding a 
safety razor blade, \\hich is more 
than handy in cutting canvas, le;ithcr, 
ripping stitches, etc., c;in easily be made 
from eitber thin hard wood (pieces of a 
aO P Oe 
"D” 
1 . 
cigar l)ox arc about tbe right tliickness 
and will do) or thin sheet iron, as shown 
in the drawings. 
Cut out a ])iece shaped as in Fig. “ A 
in which “a-a” are two thin jicgs driven 
through and extending about a sixteenth 
of an inch on one side, and "b matches 
the center hole of an ordinary water- 
edged safety razor hl.'idc, :is sliown in 
Fig. “C." Next cut out a piece sliaped 
as “B." in which “1C fits over “b" ot 
Fig. with upper edge fitting sniu; 
against pegs “a-a.” and lower edges of 
the two pieces “.V‘ and “B“ matching. 
To assemble, place a razor blade on 
“A” with the upper edge of the blade 
(^Coittlfiued OH pape 1.10) 
