In the above tables, the "Results" are in the form AA-BBc, where:

AA

Description of projectile penetration.

Code	Description
CP	Complete penetration (nose, body, and base of projectile passed entirely through plate)
IP	Incomplete penetration (no part of projectile behind plate; may or may not make a hole in plate)
PP	Partial penetration of broken/shattered projectile (upper body/nose if under 45 degrees obliquity)
SIP	Stuck In Plate. Projectile punched hole in plate and remained imbedded (damaged or intact)

BB

Description of damage to projectile. More than one type of damage may occur, but Dr. Hershey only listed worst projectile damage.

Code	Description
B2	Projectile broke into 2 big pieces roughly in the middle (usually exposes filler cavity)
BB	Body bent roughly in the middle
BF	Base flattened on side where it hit plate face
BD	Body dented/gouged on one side where it hit plate face
NU	Nose upset/compressed
NO	Nose offset/bent
NB	Nose broken off of projectile (as one piece or into several large pieces)
BC	Base cracked
NC	Nose cracked
NX	Nose shattered/chewed off (broken into small pieces)
X	Projectile nose and body shattered into many pieces (projectile rendered ineffective)
E	Projectile intact with no significant damage ("excellent")
NR	Not recovered (penetrating projectile ended up in Potomac River and was not found)

c

State of projectile filler cavity.

Code	Description
e	Projectile filler cavity remains intact, fuze undamaged, and base plug still tight ("effective")
i	Projectile filler cavity no longer intact or base plug and/or fuze damaged or knocked out ("ineffective") (U.S. Explosive "D" filler is absolutely inert under all impact conditions)

Plug Out

Base plug and fuze torn out of projectile due to damage.

Base Ring Off

Projectile base enclosing base plug torn off at driving band score (usually projectile was rendered ineffective--British Hadfield Relief Base Plug designed to correct this problem.)

Button Thrown

Plate holed and armor plug punched out plate back during an IP or PP impact (always if CP.)

Button Started

Button Started = Plate holed, but armor plug still partially attached to plate back (IP only) Face depth percentage is to point where ductile back and face merge, measured from face surface Average U.S. Navy post-1930 'Thick Chill' Class "A" armor has about 55% face depth (thickest in WWII) Tensile Strength (TS) is the average normal to the plate back surface at the back surface.