...Growth-rings constitute an accurate record ofgrowth that can be studied at any time in the life of the turtle; theyare accurate indicators of age only as long as regular annual growthpersists... 
John M. Legler 「Natural History of the Ornate Box Turtle, Terrapene ornata ornata Agassiz」
...She saw before her now, on longmetal shelves which appeared to bedelicately poised on fine scales whosebalance was registered by hair-line indicators,two small metal cages...
Various 「Astounding Stories of Super-Science April 1930」
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