"Ich Kann Handarbeiten" is the German title of a public domain book we know as "Handwork from our grandmother's era". The original was published in German by Mizi Donner and Carl Schnebel, 1913, Berlin. The tatting section, "Die Frivolitétenarbeit (Occhi Technik)" was not attributed to any one person in my edition in the front.
After comparisons, notes included below the information, illustrations and patterns shows this is work of Frau Tina Frauberger.
Tina Frauberger, neé Philippina Christina Lauterbach (1861 - 1937) married an art historian, Heinrich Frauberger (1845 - 1920), An educated and talented needle artist her first love was for tatting. She designed many patterns both graceful and dainty as well as useful and enduring.
She and her husband founded an institute which taught tatting to those blinded in WW1. During the post war years she published two books of tatting patterns. Both these books are available for free download.
The link to this excerpt from "Ich Kann Handarbeiten" is posted here:
The insertion pictured above is composed of two lines of an edging joined together by two floating rings. The open area between the center joins is filled with needle weaving. This needle weaving may be replaced with tatted rings.
The tatting techniques used include the onion ring formation and join:
And also the use of floating rings: http://www.bellaonline.com/articles/art14554.asp
Note the progress of the pattern on the diagram, A - K. Using two shuttles or two tatting needles, begin pattern with Ring A
Onion Ring A 12 - 12 clr dnrw
Ring B 17 + (use onion ring join) 17 clr rw
CH C 4 - 4 - 4 dnrw
Floating ring D 7 - 7 clr dnrw
CH E 4 - 4 - 4 dnrw
Floating ring F 7 - 7 (opposing floating ring joins to this picot later) clr dnrw
CH G 4 - 4 - 4
Floating ring H 7 - 7 (rings K and D join to this picot later) clr dnrw
CH I 4 - 4 - 4 + join to the base of the onion ring RW
CH J 7 - 7 - 7 RW
Ring K 7 + (join to ring H) 7 clr rw
CH L 7 - 7 - 7 RW
Begin repeat joining ring D to rings H and K.
Use the same method as above for the variation without needle weaving. The four rings will join in the center to one picot. Although I do not have a firm ds count I suggest the ring be at least as large as the second ring of the onion. Please try a sample before beginning your pattern. Substitute the floating ring for the two picots on chains E and G, i.e, 6 ds FR 6 ds, etc.
Tips on needle weaving: