45, COKNHILL, E.G., AND 122, KEGENT STREET, W., LONDON. Ill 



De La Rue's metallic paper is used in registration, it having the property 

 of receiving a trace from a brass pencil; The pencils can, therefore, be made 

 in the most convenient form. Mr. Beckley forms each pencil of a strip of 

 brass wrapped round a cylinder, making a very thin threaded screw, so that 

 the contact of the pencil cylinder and the clock cylinder is a mere point of the 

 metallic thread. The pencil cylinders are placed side by side upon the drum 

 turned by the clock, and require no spring or other appliance to keep them to 

 their work, but always make contact with the registration paper by their own 

 gravity. They therefore require no attention, and being as long as the trace 

 which they make they will last a considerable time. 



The velocity pencil has only one turn on the cylinder, and its pitch is equal 

 to a scale of fifty miles upon the paper. The direction pencil has likewise one 

 turn on its cylinder, its pitch being equal to a scale of the cardinal points of 

 the compass upon the paper. The Clock gives a uniform motion of half an 

 inch per hour to the Drum upon which the paper is secured. 



In the Report of the British Association for 1858, Mr. Beckley has given a 

 detailed description of his Anemometer, with drawings of all the parts. Our 

 engravings (figs. 118 and 118) show the general arrangement and details. 



The price of Beckley 's Anemometer depends so much upon the fittings 

 and the amount of work required to suit it to the building upon which it is to 

 be fixed that Negretti and Zambra can only quote 80 to 120 as the probable 

 cost of the instrument. 



151. Negretti and Zambra' s Anemometer as erected on their Holborn 

 Viaduct Establishment, shewing Direction and Pressure on Dials in the base of 

 the building. Cost according to position in which it is to be fixed. 



Special Estimates given for numbers. 



152. Our List of Registering Anemometers will hardly be deemed complete without the 

 mention of some exceedingly ingenious contrivances for obtaining records of the movements 

 of the wind by the use of a Galvanic current so arranged that any alteration in the direction 

 or force of the wind is instantly carried down to a dial or revolving drum or other me- 

 chanical contrivance for receiving the indications. 



A very elaborate description will be found in Kaemtz's Meteorology, of Professor 

 Wheatstone's Electro-Magnetic Meteorological Register, and in several foreign 

 meteorological publications will also be found details of many similar applications 

 of the electric current. 



Louis J. Crossley, Esq., of Halifax, has devoted a very large amount of time and 

 attention in perfecting a recording modification of Kobinson's Anemometer, in connection 

 with a galvanic receiving and transmitting apparatus with considerable success ; but owing 

 to the difficulty of maintaining the connections and contact breaks in perfect working order, 

 and the consequent probability of defects in the registration, the Electro-Magneto 

 Anemometers are but rarely used. 



N. and Z. have recently fitted up several different arrangements of Electrical 

 Anemometers to special order and drawings, these under careful supervision are 

 now performing satisfactorily. 



