470 ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



ernor in order to accelerate the clock one second per hour. 

 This form of governor possesses the advantage that it checks 

 any acceleration of the clock more promptly than when fric- 

 tion rubbers are carried by the governor balls; and it is also 

 easy to adjust. 12 ^4,X., 460. 



INHALATION OF OXYGEN MIXED WITH AIR, BY DIVERS, ETC. 



It is stated by Gaudin that, in repeating the experiments 

 of Touzet, by the inhalation of a mixture of equal parts of 

 air and oxygen, he experienced an unusually comfortable sen- 

 sation, which so far removed the disposition to continue res- 

 piration that he could hold his nose and close his mouth with- 

 out any discomfort for five minutes a fact which, he sug- 

 gests, may be of service to divers. 14 C, CCXIII., 1 874, 531. 



NEW SPEAKING AND HEARING TRUMPET FOR DIVERS. 



An apparatus, patented by Bremen & Co., of Kiel, and 

 introduced for trial into the German Imperial navy, not only 

 enables the diver to communicate with those at the air- 

 pump, but also to hear distinctly, to a depth of sixteen fath- 

 oms, every word spoken at the surface. The absolute safety 

 of the diver being thus secured, it is expected they will be 

 able to work for smaller wages, thus rendering their services 

 available in many cases in which they would otherwise be 

 too costly. It is said that the invention is very simple, and 

 can be attached, without much expense, to any diving ap- 

 paratus. The main principle involved is the application of 

 vibrating metallic plates for the propagation of the sound, 

 without, however, allowing them to come in contact with 

 the water. 8 (7, Nov. 19, 1874, 415. 



APPARATUS FOR RECORDING SIGNALS AUTOMATICALLY. 



Mr. W. Smith gave an account before the British Associa- 

 tion of an apparatus devised by him for recording signals 

 automatically, on a paper, in connection with the movement 

 of railway trains, so as to show exactly the circumstances 

 under which the movements of the train had been directed 

 and executed. The apparatus itself records: 1. The direc- 

 tion given and received for regulating the movements of 

 trains. 2. The movement of every signal of every kind or 

 description. 3. The movements of the points and other por- 



