454 Miscellaneous Intelligence. 



instances, of en^nes erected by Captain Samuel Grose ; dependent 

 entirely upon attention to the smaller details of the machines. 

 The best engines, heretofore, had not done more than raise forty 

 millions of pounds of water one foot high, by each bushel of coals 

 consumed, except indeed upon short occasions. In one of the cases 

 in question, an engine at Wheal Hope, of sixty-inch cylinder, work- 

 ing single as usual, the duty rose to fifty, fifty-four, and fifty-five 

 millions of pounds ; and in the other, an engine of eighty-inch 

 cylinder, at Wheal Towan, the duty rose in 



April 61,877,545 



May 60,632,179 



June 61,762,210 



Jidy 62,220,820 



August 61,764,166 



thus exceeding by nearly fifty per cent, what had been effected 

 before that time, 



3. Improved ClocJc.^—Among the articles displayed at the first 

 National Exhibition of the Objects of Arts and Industry, at Neuf- 

 chatel, Switzerland, last year, was a clock made by F. Houriet, of 

 Lode ; in which steel was used only in the main springs and in the 

 axes of the moveable parts ; all the other parts were in brass, gold 

 alloy, and white gold. The number of pieces in gold, gold and 

 silver, gold andplatina, is sixty-two : all the pivots turn on jewels, 

 and the functions of the free escapements are effected also by means 

 of pallets in precious stones. It had been supposed that the es- 

 capements and the spiral spring not being of steel, inconvenience 

 would result from the smaller degree of elasticity, but numerous 

 trials with favourable results have removed the objection ; and it 

 appears that gold, hardened either by hammering or other means, 

 is more elastic than hardened and untempered steel. The clock 

 had gone for six days, exposed to the contact of a magnet compe- 

 tent to lift twenty-five or thirty pounds, without suffering any de- 

 rangement. — Rev, Ency. 



4. Method of dividing Glass by Friction. — The following method 

 is described by Dr. Hare : " Some years ago Mr. Lukin showed 

 me that a small phial or tube might be separated into two parts, if 

 subjected to cold water after being heated by the friction of a cord 

 made to circulate about it, by two persons alternately pulling in op- 

 posite directions. I was subsequently enabled to employ this pro- 

 cess in dividing large vessels of four or five inches in diameter, and 

 likewise to render it in every case more easy and certain by means 

 of a piece of plank forked like a boot-jack, and also having a kerf 

 cut by a saw, parallel to and nearly equidistant from the principal 

 surfaces of the plank, and at right angles to the incisions productive 

 of the fork. 



^•By means of the fork, the glass is easily held steadily by the 

 hand of one operator ; by means of the kerf, the string, while circu- 



