The tinning or "silvering" process is next in order. To accomplish this, the pins are put into a vessel containing a solution of cream of tartar and tin, and boiled for four or five hours. From this they come forth bright and silvery-looking, to be dried again as before, previous to the final operation of polishing.
The pins are now ready to be put on papers. The machine which does this is perhaps one of the most ingenious ever constructed. Quantities of pins are thrown from time to time into a rapidly vibrating hopper, which causes them to pass, one by one, into a trough-like slide, that holds the pins by the head; consequently the imperfect ones are automatically rejected. They then slide along a groove to the main body of the machine, where they fall into slits properly distanced, and are pressed into the paper in rows, twelve in all, containing five hundred and sixteen pins.
Shield or safety-pins are made in about the same way, only there are twelve instead of three different stages before the pin issues from the machine absolutely complete. After this it has to be washed and tinned as above described.
The factory has more than fifty machines, which operate themselves so perfectly that they require the supervision of about ten men only.
It has been estimated that more than fifteen thousand gross of pins per day, or five million gross per annum, are turned out by this one concern.
George C. Cannon.
March 29th, 1897.
That Rust | |
| ON YOUR WHEEL CAN BE TAKEN OFF IN TWO MINUTES WITH A RAG AND SOME | |
| PRICE 25 CENTS | Great RoundWorld Polisher |
FOR SALE BY ALL DEALERS