In 1909 Florian Cajori[^Florian Cajori, '/The History of the Logarithmic Slide Rule/', Engineering news publishing Company, USA, 1909, p. 47. ^] described these two instruments as follows:

Cajori[^Florian Cajori, '/The History of the Logarithmic Slide Rule/', Engineering news publishing Company, USA, 1909, p. 47. ^] describes these two instruments as follows:

Cajori[^Florian Cajori, '/The History of the Logarithmic Slide Rule/', Engineering news publishing Company, USA, 1909, p. ^] describes these two instruments as follows:

Cajori[^Florian Cajori, "The History of the Logarithmic Slide Rule", Engineering news publishing Company, USA, 1909, p. ^] describes these two instruments as follows:

%center% http://meta-studies.net/pmwiki/uploads/PalmerCS.jpg

%center% http://meta-studies.net/pmwiki/uploads/Palmer1.jpg

Condition is remarkably good with the leather bound sides only slightly marred and the red still bright. The metal control hole is only slightly tarnished.  The circular scales both move freely. Whilst there is some discoloration to the faces every number and all instructions printed on both sides are very readable.

->Palmer and the engraver George Smith began working on their design for an "endless computing scale" in early 1841. It was copyrighted in Boston in late 1843, and versions of the device continued to be produced until at least 1852. Palmer's slide rule enjoyed only a limited success, largely because of poor marketing and the American public's fear that use of the device "[would] tend to weaken the mind, by causing it to rely upon mere mechanism to make its numbered computations"[^see Fuller, //Key to Fuller's Computing Telegraph//, 1846, above.^].

The scale is described by Hook and Norman as:


->Palmer and the engraver George Smith began working on their design for an "endless computing scale" in early 1841. It was copyrighted in Boston in late 1843, and versions of the device continued to be produced until at least 1852. Palmer's slide rule enjoyed only a limited success, largely because of poor marketing and the American public's fear that use of the device "[would] tend to weaken the mind, by causing it to rely upon mere mechanism to make its numbered computations" (Fuller, Key to Fuller's Computing Telegraph [1846], quoted in Feazel 1994, 15). Karpinski 1940, 439, points out that Palmer published A key to the endless self-computing scale, showing its application to the different rules of arithmetic (Rochester: P.S. Stoddard, 1842).[^Diana H. Hook and Jeremy M. Norman, //Origins of Cyberspace: : A Library on the History of Computing and Computer-Related Telecommunications//, Norman Publishing, 2002, pp. 269-70.^]

Palmer's Computing Scale on one side with a patent date of 1843 entered by Aaron Palmer of the clerks Office, Boston Mass., as improved by Professor Fuller with scales for percentages, monetary transactions and interest.

Fuller's Time Telegraph on the other side with a patent date of 1845, Boston, Mass., enabling the calculation of the number of days, weeks, or months to be determined between two given dates without calculations

Engraved volvelle (by George G. Smith) mounted on heavy cardboard, edges bound with gilt leather strips. 11" SQUARE

(:title ~1846: Palmer's Computing Scale and Fuller's Time Telegraph:)

->Palmer and the engraver George Smith began working on their design for an "endless computing scale" in early 1841. It was copyrighted in Boston in late 1843, and versions of the device continued to be produced until at least 1852. Palmer's slide rule enjoyed only a limited success, largely because of poor marketing and the American public's fear that use of the device "[would] tend to weaken the mind, by causing it to rely upon mere mechanism to make its numbered computations" (Fuller, Key to Fuller's Computing Telegraph [1846], quoted in Feazel 1994, 15). Karpinski 1940, 439, points out that Palmer published A key to the endless self-computing scale, showing its application to the different rules of arithmetic (Rochester: P.S. Stoddard, 1842).[^Diana H. Hook and Jeremy M. Norman, "Origins of Cyberspace: : A Library on the History of Computing and Computer-Related Telecommunications, Norman Publishing, 2002, pp. 269-70.^]

The sclae is described in by Hook et al as:

Palmer and the engraver George Smith began working on their design for an "endless computing scale" in early 1841. It was copyrighted in Boston in late 1843, and versions of the device continued to be produced until at least 1852. Palmer's slide rule enjoyed only a limited success, largely because of poor marketing and the American public's fear that use of the device "[would] tend to weaken the mind, by causing it to rely upon mere mechanism to make its numbered computations" (Fuller, Key to Fuller's Computing Telegraph [1846], quoted in Feazel 1994, 15). Karpinski 1940, 439, points out that Palmer published A key to the endless self-computing scale, showing its application to the different rules of arithmetic (Rochester: P.S. Stoddard, 1842).

Condition is remarkably good with the leather bound sides only slightly marred and the red still bright. The metal control hole is only slightly tarnished.  The circular scales both move freely. Whilst there is some discoloration to the faces every number and all instructions printed on both sides are very readable.

 Palmer and the engraver George Smith began working on their design for an "endless computing scale" in early 1841. It was copyrighted in Boston in late 1843, and versions of the device continued to be produced until at least 1852. Palmer's slide rule enjoyed only a limited success, largely because of poor marketing and the American public's fear that use of the device "[would] tend to weaken the mind, by causing it to rely upon mere mechanism to make its numbered computations" (Fuller, Key to Fuller's Computing Telegraph [1846], quoted in Feazel 1994, 15). Karpinski 1940, 439, points out that Palmer published A key to the endless self-computing scale, showing its application to the different rules of arithmetic (Rochester: P.S. Stoddard, 1842).