392 Columbium the correct name for Rose’s Niobium. 
vertical tube O, which has a stopcock 
at R, and above divides into the two 
arms 6, 6’, which pass into a metallic 
box U, and terminate in its upper part 
in open extremities cut off obliquely. 
The box U contains the burning fluid 
e, partly filling it; it connects with 
a reservoir by ¢”, which is kept at a 
constant level. The centre of this 
box isa cylindrical tube, closed below, 
through which passes the blowpipe e, 
a continuation of the tube ¢/, the left 
tubulure (in the figure) of the flask F. 
The tube which is at the middle of 
the box U, and envelops the blowpipe 
c, has several small holes wu, wu, commu- 
nicating with the empty (or upper) part of the box U. 
Above the blowpipe, and resting in a furrow in the top of the 
box U, there is a copper cup K, pierced at the centre with a hole 
for the passage of the jet of vapor which escapes from the holes 
u, u, u, after the bellows are put in action. 
To prevent the burning fluid from becoming too much heated, 
there is a trough S, containing water. Before lighting the lamp, 
-the fluid in L is heated till the water in the trough boils; then 
the bellows are made to act, and, the jet of vapor is lighted ; af- 
ter which the heat disengaged by the lamp is sufficient to con- ~ 
tinue the vaporisation of the fluid. . 
Above the box L, there is a chimney A, having a series of 
holes around, near its bottom, for drawing in air on the flame of 
the apparatus. 
M. Deville observes that those hydro-carburets which give the 
— vapors, and also have the lowest boiling point, afford the 
most heat. 


= 
Art. XLL—Observations on the Nomenclature of the metals 
contained in Columbite and Tantalite ; by Prof. A. CONNELL. 
Ty 1801 Mr. Hatchett announced the discovery of a new me 
tallic substance, contained as an oxygen acid combined with oxyd 
of iron in an undescribed heavy black mineral from Connecticut. 
T'o this new metal Mr. Hatchett gave the name of columbiutm, 
and the ore in which he found it has usually in this country been — 
called columbite. A year afterwards Ekeberg announced a new 
metal which he called tantalum, in two Swedish minerals, which 
he distinguished by the names of tantalite and yttrotantalite. 
* Phil. Mag., June, 1854, p. 461. 
