H.R.Robinson Helmet Typology

[caiusbeerquitius]

1) What's the bowl made of?: Cu Fe or U (copper, iron or unknown)
(2) What shape is the bowl? B (bulbous), C (conical), H (hemispherical), S (segmented), U (unknown, if damaged)
(3) Is the bowl decorated in any way? Y, N, U
(4) Neck guard (i.e. is there one?): Y, N, U
(5) Neck guard orientation: H (horizontal), S (sloped), N (none)
(6) Brow guard: Y, N, U
(7) Brow guard orientation: H, S, N, U
(8) Crest knob: Y, N
(9)Crest knob decoration? Y, N, U
(10) Is there ear protection? Y, N
(12) Was/is ear protection integral to the helmet bowl, or applied? I, A
(13) Are there cheek guards?: Y, N
(14)Cheek guard plain/decorated/embossed (P/D/E)
(15)Cheek guard Material Cu/Fe/ Fe - edged in Cu (Cu/Fe/FeE)
(16) Is there a face mask? Y, N

Hooray!
I think regarding the eyebrows as decoration only is too much interpretation. The also have a function, i.e. strengthening the front of the skull
Tinning: I think we should then rather say:

- tinned (y)
- partially tinned (p)
- not tinned (n)

For some helmets we have a metallurgical analysis, e.g. the Haltern helmet has a 30% tin-bronze skull and a brass brow guard... hmmm...
So maybe we should make the material list a bit more detailed for the copper alloys, like CuSn, CuZn, FE, U.
Same for the face masks

An other important feature is the presence of enamel on rivets, methinks. (Dating)

1) What's the bowl made of?: CuSn, CuZn, Fe or U
(2) What shape is the bowl? B (bulbous), C (conical), H (hemispherical), S (segmented), U (unknown, if damaged)
(3) Is the bowl decorated in any way? Y, N, U
(4) Does the skull have eyebrows? Y, N, U
(5) Neck guard (i.e. is there one?): Y, N, U
(6) Neck guard orientation: H (horizontal), S (sloped), N (none)
(7) Brow guard: Y, N, U
(8) Brow guard orientation: H, S, N, U
(9) Crest knob: Y, N
(10) Crest knob decoration? Y, N, U
(11) Is there ear protection? Y, N
(12) Was/is ear protection integral to the helmet bowl, or applied? I, A
(14) What are the ear guards made of? CuSn, CuZn, FE or U
(15) Are there cheek guards?: Y, N
(16) Cheek guard plain/decorated/embossed (P/D/E)
(17) What are the cheek guards made of? CuSn, CuZn, FE or U
(18) Is there a face mask? Y, N
(19) What is the face mask made of? CuSn, CuZn, FE or U
(20) Is the face mask decorated? Y, N, U
(21) Are there enamelled rivets on the helmet? Y, N, U