apertures in combination with slots 40 and 42 afford a wide degree of movement of gauge member 26 with respect to base plate 24 in order to utilize the above described see through gauge the operator need merely remove the existing bobbin cover plate from the machine and place the present invention in its place next the operator will adjust the gauge to be desired stitch depth as measured between surface 44 and needle secure the screw fasteners and then proceed in a normal fashion the material to be sewn will be placed in the machine in a conventional manner with the edges adjacent the portion to be seamed abutting vertical wall 44 of gauge 26 thereby providing means by which the operator can insure a constant distance between the edge of the material and the seam also as will be noted the main portion of the material will extend away from the gauge thereby leaving the window member 64 unobstructed and allowing the operator to easily view the condition of the bobbin thread should the supply of thread on the bobbin become exhausted the operator will be immediately aware of this fact and be able to replace the bobbin referring now to fig5 and 6 another embodiment of the present invention is illustrated therein being generally indicated at 76 see through sewing gauge 76 is similar to gauge 26 having a base plate 78 with an aperture 80 disposed therein a gauge member 82 movably mounted thereon through the agency of screws 84 and 86 passing through elongated slots 88 and 90 respectively and a transparent window member 92 secured to gauge member 82 in this embodiment gauge member 82 is generally rectangular in shape.