By RECENT DEVELOPMENTS WITH THE CALYX DRILL 
found further to the west. The most marked of these changes 
is the magnetic property probably imposed by the metamorphism 
induced by the proximity of the granite. On the abandonment 
of the mines, the district remained for some years undisturbed, 
a state from which it was aroused early in 1900 by the energetic 
prospecting operations of a syndicate of Halifax gentlemen, who 
it is understood control practically all of the ground described 
above, which may now under the light of recent developments 
be fairly termed the Torbrook or Nictaux “synclinal.” 
Descrvption of Drill. 
A few words may not be amiss as to the parts and working 
of this drill. It cuts a 4 or 5 inch core as desired. and the 
satisfactory results attained may be judged by the fact that the 
writer recently saw several complete unbroken cores 5 inches in 
diameter and measuring nearly 7 feet in length. An idea of 
the valuable record secured by such a core is gathered from the 
fact that they contained slate, quartzite, and magnetite with 
crystallized geodes of quartz and stringers of calespar, all 
dipping obliquely across the vertical axis of the core. 
The apparatus consists of an upright boiler and compound 
engine (about 12 h. p.), drum, chain and sprocket wheels, 
driving shaft and bevel wheel, rotating device, drill head and 
hoisting derrick. 
The drill proper consists of the “cutter,” a hollow steel 
cylinder with peculiarly shaped teeth at the bottom, set alter- 
nately at approaching and diverging angles with its axis. This is 
screwed to the bottom of the core barrel which is simply an iron 
tube of the same diameter into which the core passes when cut 
In hard rock, instead of the cutter and core-barrel, the shot 
bit and barrel, a fifteen foot steel cylinder of the same diameter 
is used, and under its edges are fed chilled steel shot, and the 
friction caused cuts the core. 
The drill rods are of 3 in. hollow steel, and are screwed by 
means of a “reducing plug” into the upper end of the core- 
barrel. 
