Elmar's for 6x6 (medium format) are not a common lens to come across, common for 35mm though. however i think you will find the Elmar is a 4 element design. in its elarly days (pre-mid 20's) its design varied somewhat from time to time, so maybe thats where some confusion comes from, and it can be said (well it said by some authors) that it is a modified triplet with the last element split and then cemented, however by enlarge it is considered a tessar based design 1-1-2...(just like a Solinar) not a triplet in the true sence we are comparing these other lenses as (cooke triplets)
Edit;; just for a more clarity- i think the modified triplet idea comes about because Leitz started with anastigmats and then came the Elmax of various configurations which ended up being a triplet, and by splitting the rear element in 1925-26 came the common/standard f3.5 Elmar 3 (1-1-2). but in reality i think its really based on a tessar which by 1926 the patents by Zeiss on the tessar freed up in some way--thats more or less how i remember it anyway