CAUTERIZATION—-FIRING. 83 
the more serious objection, however, that the assistant who has 
charge of the bellows soon becomes tired working it. 
In the cautery Paquelin de Place (fig. ~ 
41) the heat is also furnished by the 
combustion of hydrocarbon vapors. 
For needle firing, one full needle is 
made to pass through the heating 
chamber, and when it is heated, is 
brought out by pressureon the con- 
ducting rod; when cooled off, the press- 
ure is relieved and permits the needle 
to return into the heating chamber. 
Though not without advantages, this 
instrument is less handy to work with 
than the thermo or the zoocautery, 
and the cauterizing action of the hollow 
points of platinum is less active than 
that of solid points of iron or steel. 
To heat ordinary cauteries, a forge 
or a heating furnace is used. Wood 
coal or coke is preferable to other coal. 
An assistant watches the process of 
heating, and when the instrument 
has sufficient amount of heat, he takes 
hold of it, passes a file over its sharp 
part and gives it to the surgeon. 
Lagriffoul, Faugére, and Perrin 
have had the idea of using eoli- 
Lines cautery, 
ine’ poi Fig, 40—Zoocautery; A, tank; B, cocky 
joint cautery, a : 
vee _ G, hollow stem; E, fire point; H, regue 
lating screw, 
sites like that of Paquelin. These instruments are useful and keep 
the cauteries clean and free from clinkers. Some are dangerous. 
‘ That of Lagriffoul (fig. 42) is fixed on a table which carries a kind 
