no 3 748 873 on page 7 lines 35 65 where the yarn guides 52 and 53 are located at different levels to selectively transfer thread to needles following high or low level paths designated as c 39 and b 39 in fig5 of the drawings in the instant case the selected needle having picked up a thread from a higher level is brought to a lower position by the right hand stitch cam whereby the hook of the non selected needle can catch this thread before it is acted on by the right hand stitch cam 48 and brought to a position where its latch is closed in order to rearrange the cams so that the operator may then produce fair isle knitting it is merely necessary to depress cam control lever 32 as shown by fig5 a actuation of the lever 32 results in lever movement substantially the same as described previously with respect to lever 21 thus as lever 32 moves upwardly ramp 36 engages with lug 46 on the locking plate and forces the locking plate to the right against the bias of the locking plate spring 55 lug 46 is forced out of recess 29 of lever 21 thereby unlocking lever 21 the lug then moves downwardly along ramp 36 of cam control lever 32 and into recess 37 thereof to lock both of cam control levers 21 and 32 into their upper operative positions and thereby permitting both of the upper and lower jacquard cams 19 and 20 to shift upwards under the influence of their springs to adopt an upper operative locked position when so positioned as may be seen from fig7 the selected needles follow the high path through.