TY  - RPRT
TI  - Letter Circular 238: Martens' extensometer with Tuckerman optical lever system for high temperature tension tests
PY  - 1927
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 238
DO  - 10.6028/NBS.LCIRC.238
ER  -