Help deciphering a pattern

Hello!

I’m working on a sweater pattern from 1967.

I’ve already completed the back of the sweater. I have just started the first sleeve. So far I’ve done the ribbing for the edge of the sleeve (there are currently 25 stitches), and am now moving into the rest of it, which is where I’m unclear:

With size 15 needles, work pat. as on back for 6 rows. inc. 1 st each side of next row. Repeat inc. each side every 8th row 3 times, with care to carry out pat. on added sts; 33 sts. Work even until there are 38 rows of pat. - about 13 ins.- above ribbing, end on wrong side with row 2 of pat.

(BTW - the “pat. as on back” is a double seed stitch)

Does this mean, work the pattern for 6 rows, then on the NEXT row, increase 1 stitch on each side, repeating the increase each side on every 8th row three times (all in all a total of 30 rows), then knit the remaining 8 rows in pattern (without increase) to reach 38 rows?

Thank you!!
Rachel

Welcome to KnittingHelp!
Yes, 6 rows seed stitch, inc [I]each[/I] side on the very next row and increase again every 8th row 3times. You’ll have a total of 4 increases rows (8sts increased). Then continue in pattern until you have 38 rows. It’s not really clear if the 38 rows includes the 6 rows of seed stitch (probably not) but you should have about 13 inches so that’ll help you determine how long to continue the current pattern.

Thanks so much!!