180 
SHOUT NOTES ON PROFESSIONAL SUBJECTS. 
An old steam boiler tube was erected to serve the purpose of a temporary chimney, 
and a scaffold consisting of one plank supported by poles, having been constructed 
round the shaft at a convenient height, Mr. Hall—assisted only by one labourer— 
commenced to take out two complete courses of brick throughout the entire thickness 
of, aud round, the chimney, excepting the S.W. angle, which when the chimney was 
straightened would be found to be at about the proper level. As the bricks were 
taken out—two courses at a time and two bricks wide throughout—they were re¬ 
placed by two other courses of bricks of varying thicknesses set in sand mixed with 
just sufficient lime to make it bind and keep it from falling out when the sawing, 
hereafter described, commenced. 
This part of the operation occupied Mr. Hall and his assistant about eight working 
days, after which the straightening of the chimney was commenced by the very 
gradual removal of the layers of sand and courses of bricks previously put in, an iron 
cross-cut saw, of an inch thick and provided with very coarse teeth, being used for 
the former—Mr. Hall working on the outside, and his assistant on the inside, of 
the chimney. 
As the sand on top of the upper course of bricks was removed by the saw, the 
shaft gradually settled down, turning on the S.W. angle as a fulcrum. The upper 
course of bricks was then taken out and replaced by thinner bricks or tiles set in 
sand and lime as before. 
The sawing being resumed, the sand was worked out, the tiles were again removed 
and replaced only by sand, and so on. 
As the process was continued the shaft came over imperceptibly until it reached 
a perpendicular position, when it was found that the N.E. angle had fallen 5| ins., 
the N. W. and S.E. angles bins., while the S.W. angle had risen one quarter of an 
inch. 
Observations taken with the theodolite shewed that the shaft was perpendicular 
on the south side, but 4 ins. inclined on the west side; as it was impossible to make 
it absolutely upright, in consequence of the chimney having originally inclined in a 
diagonal direction. 
The last part of the operation was to replace the remaining bricks and tiles by 
bricks set in cement, and cut to suit the wedge-shaped opening left in the brickwork. 
The work was completed in three weeks. 
It is essential to ensure success that the following points be attended to :— 
1. The sand and bricks must be very carefully packed, so as to leave as little as 
possible of the shaft unsupported. 
2. This packing of sand and bricks must be removed very gradually to prevent 
the shaft from returning to a perpendicular position too rapidly. 
115. The new Weapon for the Austrian Eield Artillery. (Com¬ 
municated by Lt.-Col. W. 11. Goodenougii, R.A.) 
The bore of this gun is 6-6 ft. long; it has 24 grooves, of a depth ‘04 in.; and 
weighs, with round wedge breech-piece, 9 cwt. 66 lbs. The projectile consists of a 
long, so called, double-ringed shell, 2 \ calibres in length, with four copper rings on 
