482 Scientific Intelligence. 
as with the figures composing the fraction, render it easy to 
ogee with quickness and accuracy the first ten or twelve notes 
the harmonic series, besides facilitating experiments on co- 
flan. 
To obtain the rappin series from the open organ-pipe, it is 
found convenient to mo the size of the embouchure and 
the diameter of the sae ” For this last purpose a piece of 
wood, 120™ long, 6™ wide, and 2™ thick, is thrust into the 
pipe next the operator, thus practically diminishing the volume 
of air set in motion, and increasing the ratio of length to width. 
A sliding plate (g, ‘fig, 1,) of thin sheet-iron serves to narrow 
the embouchure at will. By varying the force of the blast 
from the lungs eight or ten successive notes of the harmonic 
series are thus secured and co mpared at the same time with 
those obtained by aid of the wire and labeled scale. The stop 
can then be thrust into one pipe, and several of the odd series 
of harmonics elicited. 
e wali of the pipe next the operator is perforated with 
three small holes, at distances 4, 3, ?, from the open end. 
These are kept stopped with plugs, which may be sveeda at 
will. Immediately around them the wall is covered with sheet 
rubber (A, h), to secure an air-tight fit for the funnel (4) from 
which a tube (/) conveys waves ‘to a manometric capsule. The 
position of nodal points in the air-column is thus shown. By 
fitting the tube (7) upon a Y-tube like that shown at (m), and 
interposing between this and another Y-tube a pair of rubber 
tubes, one of which is longer than the other by a half wave- 
length, the apparatus can be utilized for illustrating interference, 
with the aid of the manometric flame. 
40 West Fortieth street, New York, May 3d, 1882. 
SCIENTIFIC INTELLIGENCE. 
J. CHEMISTRY AND PHYSICS. 
New upparatus for determining Melting Points—Cross and 
Se have proposed a simple method for determining melting 
points which is free from some of the objections of other methods. 
A small strip of thin sheet iron 9 by 17™™ has a hole cut at one 
end to admit the bulb of the thermometer, which it fits somewhat 
closely, and contains a small indentation near the other end 1°5™ 
deep and 2™" in diameter. A glass float is also made, of very 
fine tube with a small bulb at its lower end, into which i is sealed 
a wire of the float is pla n it sia allow 
fixed by Pee The plate is hes attaphed to the chavenainte 
