. A catalogue and price-list of drawing instruments . opening and closing thelegs to make so many fine adjustments. With the screw adjustment, handledwith proper care and judgment, the centre hole can be kept in perfect condi-tion, no matter how many concentric circles are drawn about it, and, at thesame time, the operation is more convenient and accurate. PHILADELPHIA. 13 Alteneders Patent Joint Instruments. With Hair-Spring Attachment on Needle-Point Leg. Kach instrument is stamped T. Alteneder, Pat. 1871. 4- A. 1 A. Dividers, 5^-inch, same as No. 1, but with Hair-Spring Attach merit on Need
. A catalogue and price-list of drawing instruments . opening and closing thelegs to make so many fine adjustments. With the screw adjustment, handledwith proper care and judgment, the centre hole can be kept in perfect condi-tion, no matter how many concentric circles are drawn about it, and, at thesame time, the operation is more convenient and accurate. PHILADELPHIA. 13 Alteneders Patent Joint Instruments. With Hair-Spring Attachment on Needle-Point Leg. Kach instrument is stamped T. Alteneder, Pat. 1871. 4- A. 1 A. Dividers, 5^-inch, same as No. 1, but with Hair-Spring Attach merit on Needle-Point Leg 2 A. Dividers, same as No. _\ but with llair Spring Attachment,°> A. Dividers, same as No. 3, but with Hair Spring Attachment I A. Dividers, same as No. 4, but with Hair-Spring Attachment , II . A. Dividers, same as No. r », but with Hair-Spring Attachment 5 A. Dividers, same as No. 5, but with Hair Spring Attachment 6 A. Dividers, same as No. 6, but with Hair Spring Attachment VM) OO 6 50 (? 8 s s 14 THEO. ALTENEDER & SONS,. Alteneders Spring Bow Instruments. These instruments are used as adjuncts to the regularDividers and have their own special field of are made of one continuous piece of steel, finishedand tempered with the greatest care. The handle is of Ger-man silver, screwed into the instrument. The superior qualityand temper of the steel enables the points to be separatedto an unusual extent without losing stiffness. The points are drawn together by means of a thumb-nut on a fine, steel screw, acting in opposition to the spring of the legs, so that there can be no lost motion and no accidental change in the position of the points. In this respect, they Spring Bow Pen. are SUperior to Dividers, which are liable to be altered by a •jar after being set. They are, however, not intended 10 take the place of the latter, but to be used as an aid to them. Apart from their delicate adjustment for making all the small circles ona drawing, they
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectdrawing, bookyear1892
