The presentation of a new technic instrument or appliance or of a modification of a standard type of instrument or appliance should be withheld until the value of the innovation has been proved. After several years of personal use and after the receipt of many letters of praise from others, I feel justified in presenting for consideration a new type of head band.
The bands in general use do not fit the curvature of the head; in front the band rests principally on the lower segment because of the weight of the mirror. This does not favor the firm fixation of the mirror or comfort to the wearer during prolonged use.
Study of the accompanying illustration gives a clear idea of the design of the new head band. The band is cut so that the upper border is shorter than the lower, the segment having been cut from a sphere