OF SUEVEYING INSTRUMENTS. 75 



569. Tebay's Universal Planning Rule, ivory, 16s. 6d. ; boxwood, 8s. 6d. 



Marquois Scales. In mahogany cases, as supplied to the Cadets' College, at 

 Sandhurst : 



570. Boxwood . . . 10 6 

 572. Ivory ... 220 



573. Brass . . 2 10 



574. Electrum . . 3 15 



Canter's Scales. Boxwood. 



575. 12 inch. . . . 0301 577. 18 inch. . . 024 



576. 15 inch. . . . 2 | 578. 24 inch. . . 030 



Engineer's Slide Rules. Newest design. 



579. EOUTLEDGE'S, ivory, with hook, 1 10s. ; boxwood . 076 



580. HAWTHOEN'S, ivory, with book, 2 10s. ; boxwood . . 11 6 



582. Hoare's Double Slide Rule, boxwood, with book . . 086 



583. BAILEY'S DOUBLE SLIDE EULE . . . . . 150 



584. IMPEOVED SLIDE EULE, 24-inch., with single, double, and cube radius, new 



gauge points, designed and arranged by James Watt and Co. 110 



585. ENGINEEE'S EULE, 2 feet, 4 fold, designed by Col. Hyde Mint, Calcutta, 



beautifully made, with German silver slides, one with calipet end, fitting flush 

 with end of rule, and divided by vernier to '001 of inch., with metre scale and 

 Birmingham wire gauge, improved gauge points, and engraved on the joint* 

 most complete . . . . . . 200 



Pocket Rules: 



586. 1 foot, 4 fold, ivory, 2s. 6d. to 5s. 6d. ; ditto, boxwood, Is. 6d. to 026 



587. 2 foot, 4 fold, ivory, 6s. 6d. to 11s. 6d. ; ditto, boxwood, 2s. 6d. to 046 



588. 2 foot, 4 fold, ivory, bevelled edges, with chain scales for engineers, 15s. to 21s. ; 



boxwood, ditto, 6s. 6d. to 9s. 6d. 



589. Sectors, ivory, 4s. to . . . . . 086 

 Every variety of scales, English and foreign, ivory and boxwood, including Ordnance and 



Board of Health scales, kept in stock and made to order. 



STATION POINTERS. 



Station pointer or double arm protractor, with which two angles relative to a base may 

 be taken together ; a convenient instrument for plotting or sketching in new countries 

 where magnetic bearings may lead to error, from local and various causes unknown. 



590. 12 inch., with 6-inch, circle 6601 593. 24 inch., with 7-inch, circle 8 10 



592. 18 inch., with 7-inch, circle 7 | 594. 30 inch., with 8-inch, circle 1100 



595. 36 inch., with 10-inch, circle, divided on silver to 1 minute 16 16 



PENTAGRA PH S, 



As supplied to the Indian Government, much improved, for copying or extracting 

 portions of plans of land to a reduced scale, enlarging drawings, etc., 



COMPLETE IN MAHOGANY CASES. 



596. 18 inch. . . 4001 598. 30 inch. . . 600 



597. 24 inch. . . 5 | 599. 36 inch. . . 7 10 



600. 42 inch. (fig. 600), p. 76 . . . 8 18 



602. Eidograph; Professor Wallace's, admirably adapted for reducing plans, as in 

 proportion 1 to 2, 9 to 25, etc., 30-inch., 10 ; 36-inch. 11 17 6 



