Calendar: 1930-1931 Page 506

HAR LINGS "Civil Engineers" Adjustable Set Square THE Harling new "C Adjustable Set Square combines the chief advantages of the old type of adjustable set square with those of the Clinograph-not only can it be set instantly at any required angle but it may be used on either side as there are no projecting parts Constructed similarly to the Clinograph it has in addition graduated arc divided from ο dcg to 45 deg by 30 mins and on account of the large radius of the arc 15 mins can be estimated easily The Harling "C Set Square is designed to give great rigidity to the moving arm which can thus be used as ruling edge with- out fear of movement and to control practically the whole area of the drawing deg lines can be drawn within 2" of the bottom of the board instead of the usual 5" Besides the usual protractor marking each "C Set Square is engraved with the angles for Rolled Steel Beams and Channels Obtainable from HARLING LIMITED British Mathematical Drawing and Surveying Instrument Manufacturers 117 MOORGATE Established 1851 Telegrams "Clinograph London Grosvenor Works Clapton No 920 Size 7" Packed in Card Case 13