Developed the helixometer, a magnifier probe used to examine the interior of firearm barrels and accurately measure the pitch of rifling.
A. Goddard and Waite
B. Goddard and Gravelle
C. Doddard and Fisher
D. Waite and Fisher
Answer:C
Developed the helixometer, a magnifier probe used to examine the interior of firearm barrels and accurately measure the pitch of rifling.
A. Goddard and Waite B. Goddard and Gravelle C. Doddard and Fisher D. Waite and Fisher