45, COENHILL, B.C., AND 122, EEGENT STREET, W., LONDON. 



Solid Copper Lightning Conductor fitted with Point and 

 three Attractors, as fig. 129, with 7 Holdfasts, 7 Insulators, and 

 1 Straining Bolt, complete ....... 



Ditto Ditto, with 11 Holdfasts and 11 Insulators . 



Ditto Ditto, with 15 Holdfasts 15 Insulators . 



Ditto Ditto, with 24 Holdfasts and 12 Insulators . 



129 



Each. 

 s. 



2 14 



3 



3 6 



4 4 



If the Points are wished tipped with Platinum, there will be an extra 

 charge, according to the size and weight. Price variable. 



Galvanised Iron Holdfast, to build in, 

 Ditto Ditto 



Ditto Ditto 



Ditto Ditto 



Straining Bolt 



No. 1, fig. 131, per doz. 

 to Drive No. 4 Do. per doz. 



for passing along Slated Roof, 



No. 3 Do. per doz. 

 extra strong, for supporting Bod or 

 . No. 2 Do. per doz, 

 Copper Elevating Rod, No. 6, fig. 130*, showing Holdfast and 

 Glass Insulator, to steady the same ...... 



Straining Bolt, No. 7, fig. 130*, with Glass Insulator and Holdfast 

 complete for til m ch diameter Rope 



12s. 6d., 10s. 6d., 7s. 6d., per set. 

 Tension Bolt, for tightening and straightening the wire, of a simple 



form 8s, 6d. 



Glass Insulators annealed with lock nibs . per doz. 10s. and 



Solid Copper Wire Rope, f inch diameter. Price per 100 feet . 



Ditto Ditto J inch diameter. 



Ditto Ditto I- inch diameter. 



Price per 100 feet 

 Price per 100 feet 



096 

 096 



11 6 

 10 

 086 



10 6 

 14 

 6 10 

 550 

 3 16 



NOTE. The prices for Copper goods vary according to the market value 

 of the metal. At a small increase of cost the Points can be strongly gilt. 



Estimates given for fitting up Lightning Conductors, 

 either with Copper Wire Rope, Solid Copper Rod or Bands. 



181 Lightning Conductors, 



The celebrated American philosopher, Franklin, in the year 1749, 

 first discovered the means of averting the destructive and fatal 

 effects of lightning by the use of pointed metallic rods attached to 

 high and exposed buildings, his experiments having proved that 

 the electric fluid will always follow the path of least resistance to 

 the earth. 



In confirmation of the value of Lightning Conductors as a 

 safeguard, we quote the following from Sir W. Snow Harris : 



" It appears from the records of the Navy, that the destructive 

 effects of lightning on H.M. ships involved in former years an 

 expenditure of not less than from 6,000 to 10,000 annually. In 

 200 cases only, 300 seamen were either killed or hurt, and above 

 100 large masts valued at the time at from 1,000 to 1,200 each 

 entirely ruined. Between 1810 and 1815, 35 sail of the line, 35 

 frigates and smaller vessels were completely disabled. 



" Since the system of Lightning Conductors has been fully 

 carried out in all H.M. Ships, it appears damage by lightning has 

 almost vanished from the records of the Navy." 



FIG. 132. 



