New Britain herald., 1922-12-01
NEW BRITAIN DAILY HERALD, FRIDAY, DECEMBER I, 1922.

ISpray test was employed and the re.
 suits were as follows,
 Eleetrorgalvanized nails broke down on the first day; sherardized nails
 broke down on the second day; never, rust brand hot galvanized nails broke down on the fospteenth day.
 We attribute the superior durabil- ity of the hot process to the simple fact that hot galvanized material carries heavier coating of zinc than either sherardiaed or electro -gnlyan- laed material, There Arr only two classes Of work on which 1t has proven possible to reduce the zinc coating when hot salyaniying k employed. One is, on galvanized iron sheets and the other Is on galvanized wire and in both cases the results have been un- satisfactory from the standpoint Of durability. nf
 We have heen repeatedly ap- preached by farmers aA along the seaeoast with requests that we re- salsnnize their fence wire, The fence wire Is run through the hot galvaniz- lrg kettles and ont through an asbes-
 
 coating of zinc and which also re- dpces the capacity Of the wire to re- sist rust.
 We regard sherardiIng as the next choice to hot golvaniMng. It is par ticularly valuable in connection with threaded work such ns machine screws or other bolts that have fine thread and which are often required to take nut. When such material is treated by the hot process, the threads i'll up and 1t is necessary to machine them after galvanizing. chas- ing lightly over the threads. but of course. great deal of zinc is re- moved in this manner. Sometimes centrifugal machines Are used to re- move the excess zinc applied by hot galvanizing to threaded work. but the machines throw of so much of the zinc that the material will not stand Again on material which it is neces- sary to bend after galvanizing, sher- ardizing Is very useful. Zinc is brit tie and the heavy coating applied by the hot process will flake of from ma terisl that must be bent after gal 
 On the other hand the coating ap- piled by the sherardizng process is not uniform. We find that the sher- 1 ,raizing work which has come to our intention varies greatly in the coating Zinc dust is poor conductor of heat md while the material in the outer portion of the sherardizing drum is heated and takes on a good coating of zinc, the material in he center part Of the drum in many | cases is not sufficiently heated and ! akes on a much lighter coating.
 One of our friends who used to send wire chain to lis to be hot galvanized ried sherardizing because it was .heaper. He found that part of the .hain which was sherardized was suf- iciently coated for his purpose but hat otffers of the same piece the was all together too light and he only way to tell whether the chain | vas right or not was by continually esting all parts of it.
 To our way of thinking one of the weakest bonus oI ooln the Siicid di oD- ng and -galvanizins processes S that the coating can be made very ieht as the operator desires it, and 1t $ apparent that many of the opera ors are taking advantage of this fact t means a reduction in manufhctIr- f ng costs but it also means a redtc- 1. ion in the durability of the material ihich is treated. q We suppose that there are uses for lectro- -galvanizing but our thought IS \ hat it should be a last resort. me