50 



DISCOVERY 



apparatus known as tlu' perforator. This is at present 

 worked by compressed air, and is so designed that it 

 punches on a moving strip of paper a duplicate of the 

 arrangement of holes representing the dots and 



The new thing atxjut these instruments is that the 

 receiver has now been adapted to wireless transmission 

 so that messages from places as far distant as Paris 

 may be automatically printed. Very successful experi- 



dashes which was used at the sending station for trans- 

 mitting the message. When this is done the hard 

 work is all over. It is then a comparatively simple 

 matter to translate the Morse Code message into 

 Roman letters with an instrument similar to the one 

 used for several years in a newspaper office. 



At the meeting at which Mr. Campbell Swinton 

 demonstrated the Creed apparatus he picked up a 

 message sent out by Horsea, near Plymouth, with 

 the Creed receiver, printed it in Roman type, and 

 projected the words and letters by means of a lantern 



FROM THE EIFFEL TOWER PARIS 

 RECORDED ON A CREED TV PE - P R I NT I NG 

 RECEIVER AT A MEETINM 

 OF The ROYAL SOCIETY OF ARTS 



FlO. 3.— FACSIMILE REPRODUCTION OK PORTION OF MESSAGE 

 RECEIVED FROM PARIS, AS AUTOMATICALLY PRINTED. 



on to the screen for his audience to see. Later in the 

 evening a special message was sent him by wireless 

 from the Eiffel Tower, and this too was automatically 

 printed and then projected on to the screen. A 

 facsimile reproduction of portion of this message as 

 automatically printed is given in Fig. 3. 



mental work has been carried out in this way between 

 Cologne and Aldershot, and a wdreless printing equip- 

 ment of this kind is to be used between a large station 

 in the Congo Free State and Brussels. The manufac- 

 turers are at present developing an improved form of 

 printer in which compressed air is dispensed with. 

 The present apparatus as adapted to wireless reception 

 is capable of a speed of transmission of 180 words a 

 minute, which is greater than that of the printer. The 

 improved printer, however, will be capable easily of 

 keeping up with the receiver. Quickness of trans- 

 mission and reception is of course important, not only 

 because more message can be received in a given time, 

 but also because each message has a better chance of 

 being received complete without interruption by 

 " atmospherics " or other causes. 



The following are suitable books on Weeds, for further 

 reading : 



Common IVeeds of Farm and Garden. By H. C Long. 

 (Smith Elder, 1910. 6s.) 



Weeds of Farm Land. By Dr. \V. E. Brcnchley. (Long- 

 mans, 1920, 12s. td.) 



Articles both on the subject generally and on specific weeds 

 will be found in periodicals like the Journal of the Ministry of 

 Agriculture, Journal of the Royal Agricultural Society of 

 Fngland, Journal of the Highland Society, etc. 



