are purchasing these types of machines so they can sew extra large thread sizes up to Tex 500 or Tex 600 thread sizes. Another option for sewing heavy threads on 301 lockstitch machines is to sew the heavy thread in the bobbin and using a regular size thread in the needle. This means that the seam is inverted when it is sewn.
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field. Therefore whereas a dental x-ray room may require a nominal shielding of about 1.5mm lead for the direct beam and about 0.7mm lead for the scattered field, a diagnostic x-ray room may require a nominal shielding of about 3mm and 1.5mm for the direct beam and scattered field respectively. For clay brick and concrete, the equivalent material thicknesses at different x-ray output voltages are given in Table 1. The nominal thicknesses of commercially available lead sheets are given in Table 2. Protective shielding close to the x-ray head is the most economical arrangement; the thickness is the same, but the area to be covered is smaller. Most x-ray housings have sufficient