Surveying and Levelling Instruments, Theoretically and Practically Described. / For construction, qualities, selection, preservation, adjustments, and uses; with other apparatus and appliances used by civil engineers and surveyors in the field.

by William Ford Stanley

[52] Patent No. 1202, D. R. Edgeworth, April 1866.

[53] Heather's Surveying Instruments, 1870, p. 85.

[54] The Surveyor, vol. ii. No. 5. Sydney, Nov. 1889.

[55] Patent No. 2142, May, 1880.

[56] Manual of Surveying for India, p. 478, 1875.

[57] Patent No. 3390, October 1874.

[58] For full description and plate, see Everest's Measurement of the Meridional Arc of India, Introd. p. cxv.

[59] British patent, No. 10157, April, 1844.

[60] British patents—No. 13332, November, 1850; and No. 682, March, 1862.

[61] Patent, No. 13332, May, 1850.