Drew;
Do you have a date for this chart? It shows 9 towers as opposed to the 6 Steele & Harrison show. They only show Tatham from NY & do not show the Iowa or San Francisco towers. This chart looks very similar to one in a circa 1913 Lefever Arms Co catalog, though I do not recall off hand how many towers are shown in it.
Sparks, Tatham & Le Roy are the only towers S&H listed by name the other three are listed only by location. A Baltimore tower is the one which showed a count of 815 for #10 while this chart shows 1130 for the tower located in Baltimore. Sizes from #9 & larger are similar though not identical but sizes 10, 11 & 12 are listed with much higher counts in this chart from the Baltimore tower.
Note that all shot produced by a tower is "Dropped" & all is "Chilled" when it strikes the water. The two terms basically came to mean that Drop Shot was essentially unalloyed while Chilled Shot was alloyed, primarily with Antimony, to increase its hardness. For "flowability" either type might have a trace of Tin or Arsenic.
Thanks for posting this chart.
