τετράγωνον διπλοῦν ἐπόησαν τὸ λογεῖον· σπιθαμῆς τὸ μῆκος, καὶ σπιθαμῆς τὸ εὖρος διπλοῦν.

1. τετράγωνον
   square
2. διπλοῦν
   double
3. ἐπόησαν
   they made
4. τὸ
   the
5. λογεῖον
   breastplate
   breastpiece, oracle
6.  
   ·
    
7. σπιθαμῆς
   of a span
   span
8. τὸ
   the
9. μῆκος
   length
10.  
    ,
     
11. καὶ
    and
12. σπιθαμῆς
    of a span
    span
13. τὸ
    the
14. εὖρος
    width
15. διπλοῦν
    double
16.  
    .
     

They made the breastplate square and double, a span in length and a span in width when doubled.